Makefile: hide stderr of curl-config test

You will get

    $ make distclean 2>&1 | grep curl
    /bin/sh: curl-config: not found
    /bin/sh: curl-config: not found
    /bin/sh: curl-config: not found
    /bin/sh: curl-config: not found
    /bin/sh: curl-config: not found
    $

if you don't have a curl development package installed.

The intent is not to alarm the user, but just to test if there is
a new enough curl installed.  However, if you look at search engine
suggested completions, the above "error" messages are confusing
people into thinking curl is a hard requirement.

Redirect this error output to /dev/null as it is not necessary to be
shown to the end users.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -1564,7 +1564,7 @@ else
 	REMOTE_CURL_NAMES = $(REMOTE_CURL_PRIMARY) $(REMOTE_CURL_ALIASES)
 	PROGRAM_OBJS += http-fetch.o
 	PROGRAMS += $(REMOTE_CURL_NAMES)
-	curl_check := $(shell (echo 070908; curl-config --vernum) | sort -r | sed -ne 2p)
+	curl_check := $(shell (echo 070908; curl-config --vernum) 2>/dev/null | sort -r | sed -ne 2p)
 	ifeq "$(curl_check)" "070908"
 		ifndef NO_EXPAT
 			PROGRAM_OBJS += http-push.o