lib: work around automake subdirectory limitation (fixes #9367)

lib/Makefile.am

@@ -51,8 +51,7 @@ libvlc_la_SOURCES = \
 	media_list_path.h \
 	media_list_player.c \
 	media_library.c \
-	media_discoverer.c \
-	../src/revision.c
+	media_discoverer.c
 EXTRA_DIST = libvlc.pc.in libvlc.sym ../include/vlc/libvlc_version.h.in
 
 libvlc_la_LIBADD = \

lib/core.c

@@ -36,6 +36,8 @@
 #include <limits.h>
 #include <assert.h>
 
+#include "../src/revision.c"
+
 static const char nomemstr[] = "Insufficient memory";
 
 libvlc_instance_t * libvlc_new( int argc, const char *const *argv )