curl-config: don't output static libs when they are disabled

Curl-config outputs static libraries even when they are disabled in
configure.

This causes problems with the build of pycurl.

configure.ac

@@ -3350,6 +3350,11 @@ dnl yes or no
 ENABLE_SHARED="$enable_shared"
 AC_SUBST(ENABLE_SHARED)
 
+dnl to let curl-config output the static libraries correctly
+ENABLE_STATIC="$enable_static"
+AC_SUBST(ENABLE_STATIC)
+
+
 dnl
 dnl For keeping supported features and protocols also in pkg-config file
 dnl since it is more cross-compile friendly than curl-config

curl-config.in

@@ -155,7 +155,12 @@ while test $# -gt 0; do
         ;;
 
     --static-libs)
-        echo @libdir@/libcurl.@libext@ @LDFLAGS@ @LIBCURL_LIBS@
+	if test "X@ENABLE_STATIC@" != "Xno" ; then
+		echo @libdir@/libcurl.@libext@ @LDFLAGS@ @LIBCURL_LIBS@
+	else
+		echo "curl was built with static libraries disabled" >&2
+		exit 1
+	fi
         ;;
 
     --configure)