mesa: fix dependency tracking of generated sources

Some of the files generated were not in the SOURCES variable, thus
although generated prior to compilation the dependency tracking was
incomplete. The latter of which resulted in the files missing from the
distribution tarball.

Cc: "10.5" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

src/mesa/Makefile.sources

@@ -86,6 +86,7 @@ MAIN_FILES = \
 	main/ffvertex_prog.h \
 	main/fog.c \
 	main/fog.h \
+	main/format_info.h \
 	main/format_pack.h \
 	main/format_pack.c \
 	main/format_unpack.h \
@@ -100,6 +101,7 @@ MAIN_FILES = \
 	main/framebuffer.h \
 	main/get.c \
 	main/get.h \
+	main/get_hash.h \
 	main/genmipmap.c \
 	main/genmipmap.h \
 	main/getstring.c \