Remove unused variables

GCC -Wall complains about them.

WINGs/dragdestination.c

@@ -289,8 +289,7 @@ findDestinationViewInToplevel(WMView* toplevel, int x, int y)
     WMScreen *scr = W_VIEW_SCREEN(toplevel);
     Window toplevelWin = WMViewXID(toplevel);
     int xInToplevel, yInToplevel;
-    Window child, foo;
-    WMView *childView;
+    Window foo;
 
     XTranslateCoordinates(scr->display, scr->rootWin, toplevelWin,
                           x, y, &xInToplevel, &yInToplevel,

src/main.c

@@ -177,10 +177,6 @@ extern int MonitorLoop(int argc, char **argv);
 
 static Bool multiHead = True;
 
-/* stdi/o for log shell */
-static int LogStdIn = -1, LogStdOut = -1, LogStdErr = -1;
-
-
 static int real_main(int argc, char **argv);
 
 void

util/fontconv.c

@@ -130,7 +130,7 @@ char*
 xlfdToFc(char *xlfd, char *useFamily, Bool keepXLFD)
 {
     str *tokens, *family, *weight, *slant;
-    char *name, buf[64], *slt;
+    char *name, buf[64];
     int size, pixelsize;
 
     tokens = getXLFDTokens(xlfd);