wmmenu: Update to compile with modern GDK-PixBuf.

In particular,
- We need to link against gdk_pixbuf-2.0 in addition to
  gdk_pixbuf_xlib-2.0.
- The header gdk-pixbuf-xlib.h has been moved to the gdk-pixbuf-xlib
  directory.
- The function gdk_pixbuf_new_from_file now requires two arguments.
- We need to define GdkColor ourselves since we don't include gdk.h.

Inspired by a patch by Nerijus Baliunas [1].

[1] http://lists.windowmaker.org/dev/msg07994.html

wmmenu/Makefile

@@ -11,7 +11,7 @@ ifdef GDKPIXBUF2
 PIXBUF_CFG = pkg-config gdk-pixbuf-xlib-2.0
 PIXBUF_DEF = -DWITH_GDKPIXBUF
 PIXBUF_INC := $(shell $(PIXBUF_CFG) --cflags)
-PIXBUF_LIB := -rdynamic -L$(shell $(PIXBUF_CFG) --variable=prefix)/lib -lgdk_pixbuf_xlib-2.0
+PIXBUF_LIB := -rdynamic -L$(shell $(PIXBUF_CFG) --variable=prefix)/lib -lgdk_pixbuf_xlib-2.0 -lgdk_pixbuf-2.0
 endif
 
 CC = gcc #-g

wmmenu/pixmaps.c

@@ -2,7 +2,7 @@
 #include <assert.h>
 
 #ifdef WITH_GDKPIXBUF
-#include <gdk-pixbuf/gdk-pixbuf-xlib.h>
+#include <gdk-pixbuf-xlib/gdk-pixbuf-xlib.h>
 #endif
 #include <dockapp.h>
 
@@ -28,6 +28,7 @@ extern void Pixmaps_FindLoad (const char * name,
     GdkPixbuf * pix ;
     int width, height ;
     void (* problem) (const char *, ...) ;
+    GError *gerror = NULL;
 
     if (mustInitGdkPixbuf)
     {
@@ -59,7 +60,7 @@ extern void Pixmaps_FindLoad (const char * name,
         UseDefault () ;
     }
     else
-    if ((pix = gdk_pixbuf_new_from_file (path)) == NULL)
+    if ((pix = gdk_pixbuf_new_from_file (path, &gerror)) == NULL)
     {
         problem ("can't load image \"%s\"", path) ;
         UseDefault () ;
@@ -112,6 +113,13 @@ We have to reimplement a few trivial gdk functions here to avoid linking with
 it !
 */
 
+typedef struct {
+    guint32 pixel;
+    guint16 red;
+    guint16 green;
+    guint16 blue;
+} GdkColor;
+
 extern gint gdk_screen_width (void)
 {
     return DisplayWidth (DADisplay, DefaultScreen (DADisplay)) ;