Decide whether to build http-push in the Makefile

The decision about whether to build http-push or not belongs in the
Makefile.  This follows Junio's suggestion to determine whether curl
is new enough to support http-push.

Signed-off-by: Nick Hengeveld <nickh@reactrix.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -242,9 +242,12 @@ ifndef NO_CURL
 		CURL_LIBCURL = -lcurl
 	endif
 	PROGRAMS += git-http-fetch$X
-	ifndef NO_EXPAT
-		EXPAT_LIBEXPAT = -lexpat
-		PROGRAMS += git-http-push$X
+	curl_check := $(shell (echo 070908; curl-config --vernum) | sort -r | sed -ne 2p)
+	ifeq "$(curl_check)" "070908"
+		ifndef NO_EXPAT
+			EXPAT_LIBEXPAT = -lexpat
+			PROGRAMS += git-http-push$X
+		endif
 	endif
 endif
 

http-push.c

@@ -6,8 +6,6 @@
 #include "blob.h"
 #include "http.h"
 
-#ifdef USE_CURL_MULTI
-
 #include <expat.h>
 
 static const char http_push_usage[] =
@@ -1426,10 +1424,3 @@ int main(int argc, char **argv)
 
 	return rc;
 }
-#else /* ifdef USE_CURL_MULTI */
-int main(int argc, char **argv)
-{
-	fprintf(stderr, "http-push requires curl 7.9.8 or higher.\n");
-	return 1;
-}
-#endif