Fix longstanding mismerge of ALL_CFLAGS vs BASIC_CFLAGS

The earlier commit d7b6c3c0 (Aug 15, 2006) introduced this
mismerge when most of the CFLAGS were renamed to BASIC_CFLAGS.

Not that it matters right now, since we do not compile XS
Perl extensions which wanted non GNU subset of ALL_CFLAGS for
compilation, but we should make things consistent.

Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -504,7 +504,7 @@ ifdef NO_D_INO_IN_DIRENT
 	BASIC_CFLAGS += -DNO_D_INO_IN_DIRENT
 endif
 ifdef NO_C99_FORMAT
-	ALL_CFLAGS += -DNO_C99_FORMAT
+	BASIC_CFLAGS += -DNO_C99_FORMAT
 endif
 ifdef NO_SYMLINK_HEAD
 	BASIC_CFLAGS += -DNO_SYMLINK_HEAD