Makefile: fix location of listing produced by "make subdir/foo.s"

When I invoke "make block-sha1/sha1.s", 'make' runs $(CC) -S without
specifying where it should put its output and the output ends up in
./sha1.s.  Confusing.

Add an -o option to the .s rule to fix this.  We were already doing
that for most compiler invocations but had forgotten it for the
assembler listings.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Makefile b/Makefile
index e4f8e0e..d03fee7 100644
--- a/Makefile
+++ b/Makefile
@@ -2116,7 +2116,7 @@
 endif
 
 %.s: %.c GIT-CFLAGS FORCE
-	$(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $<
+	$(QUIET_CC)$(CC) -o $@ -S $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $<
 
 ifdef USE_COMPUTED_HEADER_DEPENDENCIES
 # Take advantage of gcc's on-the-fly dependency generation