Get app_server working on x86_64.

With this commit, app_server now compiles and runs at boot! Nothing
particularly interesting happens, just the blue background and a mouse
pointer. Remote backends are broken and not compiled in, see #8834.
Note that it won't be possible to build this quite yet, need to get
the FreeType package uploaded.

src/servers/app/DesktopSettings.cpp

@@ -293,7 +293,7 @@ DesktopSettingsPrivate::_Load()
 			// colors
 			for (int32 i = 0; i < kNumColors; i++) {
 				char colorName[12];
-				snprintf(colorName, sizeof(colorName), "color%ld",
+				snprintf(colorName, sizeof(colorName), "color%" B_PRId32,
 					(int32)index_to_color_which(i));
 
 				settings.FindInt32(colorName, (int32*)&fShared.colors[i]);
@@ -438,7 +438,7 @@ DesktopSettingsPrivate::Save(uint32 mask)
 
 			for (int32 i = 0; i < kNumColors; i++) {
 				char colorName[12];
-				snprintf(colorName, sizeof(colorName), "color%ld",
+				snprintf(colorName, sizeof(colorName), "color%" B_PRId32,
 					(int32)index_to_color_which(i));
 				settings.AddInt32(colorName, (const int32&)fShared.colors[i]);
 			}