wmaker: Fix compiler warnings about pointer <--> integer conversion

There may be issues with running applications in 64-bit mode when
they were written with tacit assumptions about 32-bit platforms.
For example,

    * Assuming that a pointer can be cast back and forth to an integer

The reason is that the size of the integer and pointer may be different.
See the description of "[PATCH] Warn when casting a pointer (constant)
to an integer of different size." in the gcc mailing list

http://gcc.gnu.org/ml/gcc-patches/2005-12/msg01881.html

where it was also suggested the use of casts to uintptr_t. This is
what this patch does.

As a result the following warnings are fixed, leaving us with an
almost warning-free compilation in 64-bit platforms:

defaults.c:1446: warning: cast to pointer from integer of different size
defaults.c:1457: warning: cast to pointer from integer of different size
defaults.c:1471: warning: cast to pointer from integer of different size
defaults.c:1486: warning: cast to pointer from integer of different size
icon.c:67: warning: cast from pointer to integer of different size
menu.c:112: warning: cast from pointer to integer of different size
switchmenu.c:452: warning: cast from pointer to integer of different size
window.c:140: warning: cast from pointer to integer of different size
window.c:2217: warning: cast to pointer from integer of different size
workspace.c:135: warning: cast to pointer from integer of different size
workspace.c:214: warning: cast to pointer from integer of different size
workspace.c:634: warning: cast to pointer from integer of different size
workspace.c:1330: warning: cast to pointer from integer of different size
workspace.c:1514: warning: cast to pointer from integer of different size
wfilepanel.c:135: warning: cast from pointer to integer of different size
wfilepanel.c:171: warning: cast from pointer to integer of different size
wfontpanel.c:499: warning: cast to pointer from integer of different size
wfontpanel.c:500: warning: cast to pointer from integer of different size
wfontpanel.c:505: warning: cast to pointer from integer of different size
wfontpanel.c:506: warning: cast to pointer from integer of different size
wfontpanel.c:776: warning: cast from pointer to integer of different size
wfontpanel.c:777: warning: cast from pointer to integer of different size
wfontpanel.c:877: warning: cast from pointer to integer of different size
wfontpanel.c:878: warning: cast from pointer to integer of different size
wpanel.c:363: warning: cast from pointer to integer of different size
fontl.c:42: warning: cast from pointer to integer of different size
fontl.c:42: warning: cast from pointer to integer of different size
fontl.c:42: warning: cast from pointer to integer of different size
fontl.c:90: warning: cast to pointer from integer of different size
puzzle.c:138: warning: cast from pointer to integer of different size
puzzle.c:225: warning: cast to pointer from integer of different size
wtableview.c:1031: warning: cast to pointer from integer of different size
wtableview.c:1067: warning: cast to pointer from integer of different size
wtableview.c:1069: warning: cast to pointer from integer of different size
wtableview.c:1074: warning: cast to pointer from integer of different size
wtabledelegates.c:234: warning: cast from pointer to integer of different size
wtabledelegates.c:250: warning: cast from pointer to integer of different size
wtabledelegates.c:265: warning: cast from pointer to integer of different size
wtabledelegates.c:287: warning: cast to pointer from integer of different size
wtabledelegates.c:351: warning: cast from pointer to integer of different size
wtabledelegates.c:372: warning: cast from pointer to integer of different size
wtabledelegates.c:393: warning: cast from pointer to integer of different size
wtabledelegates.c:410: warning: cast to pointer from integer of different size
test.c:44: warning: cast from pointer to integer of different size
test.c:47: warning: cast to pointer from integer of different size
test.c:55: warning: cast from pointer to integer of different size
test.c:58: warning: cast from pointer to integer of different size

WINGs/Examples/fontl.c

@@ -24,6 +24,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <WINGs/WINGs.h>
 #include <WINGs/WUtil.h>
 
@@ -39,7 +40,8 @@ void show(WMWidget *self, void *data)
     void *d;
     WMLabel *l = (WMLabel*)data;
     d = WMGetHangedData(self);
-    sprintf(buf, "%i -  0x%x - 0%o", (int)d, (int)d, (int)d);
+    sprintf(buf, "%i -  0x%x - 0%o", (int)(uintptr_t)d, (int)(uintptr_t)d, 
+	    (int)(uintptr_t)d);
     WMSetLabelText(l, buf);
 }
 
@@ -87,7 +89,7 @@ main(int argc, char **argv)
             sprintf(buf, "%c", c);
             WMSetButtonText(lab, buf);
             WMSetButtonAction(lab, show, pos);
-            WMHangData(lab, (void*)c);
+            WMHangData(lab, (void*)(uintptr_t)c);
             if (c>0) {
                 WMGroupButtons(l0, lab);
             } else {