Updates Makefile.sources and fixes the following building error:
In file included from external/mesa/src/vulkan/util/vk_format.c:24:
In file included from external/mesa/src/vulkan/util/vk_format.h:28:
external/mesa/src/util/format/u_format.h:33:10: fatal error: 'pipe/p_format.h' file not found
#include "pipe/p_format.h"
         ^~~~~~~~~~~~~~~~~
1 error generated.
Fixes: 3a28281 ("util: Add a mapping from VkFormat to PIPE_FORMAT.")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
 
 LOCAL_C_INCLUDES := \
        $(MESA_TOP)/include/vulkan \
-       $(MESA_TOP)/src/vulkan/util
+       $(MESA_TOP)/src/vulkan/util \
+       $(MESA_TOP)/src/gallium/include
 
 ifeq ($(shell test $(PLATFORM_SDK_VERSION) -ge 27; echo $$?), 0)
 LOCAL_C_INCLUDES += \
 
        util/vk_alloc.h \
        util/vk_debug_report.c \
        util/vk_debug_report.h \
+       util/vk_format.c \
        util/vk_util.c \
        util/vk_util.h