Fix gcc warnings

This patch fixes the following warnings (with gcc 4.2.3)

    defaults.c:980: warning: unused variable 'replace'
    main.c:504: warning: 'watchPath' may be used uninitialized in this function
    main.c:504: note: 'watchPath' was declared here
    startup.c:616: warning: implicit declaration of function 'XrmUniqueQuark'

src/defaults.c

@@ -977,7 +977,7 @@ static Bool
 fixupCachedPixmapsPaths(WMPropList *dict)
 {
     WMPropList *allApps, *app, *props, *iconkey, *icon, *newicon;
-    char *path, *fixedpath, *ptr, *search, *replace;
+    char *path, *fixedpath, *ptr, *search;
     int i, len, slen;
     Bool changed = False;
 

src/main.c

@@ -501,7 +501,7 @@ check_defaults()
 static void
 inotifyWatchConfig()
 {
-    char *watchPath;
+    char *watchPath = NULL;
     inotifyFD = inotify_init(); /* Initialise an inotify instance */
     if (inotifyFD < 0) {
          wwarning(_("could not initialise an inotify instance."

src/startup.c

@@ -34,6 +34,7 @@
 #endif
 
 #include <X11/Xlib.h>
+#include <X11/Xresource.h>
 #include <X11/Xutil.h>
 #include <X11/cursorfont.h>
 #include <X11/Xproto.h>