configure: Fix testing of objective-c headers for qtkit

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -943,6 +943,16 @@ int x;
 EOF
 }
 
+check_header_oc(){
+    log check_header_oc "$@"
+    header=$1
+    shift
+    {
+       echo "#include <$header>"
+       echo "int main(void) { return 0; }"
+    } | check_cc "-x" "objective-c" "$@" && enable_safe $headers
+}
+
 check_func(){
     log check_func "$@"
     func=$1
@@ -4649,7 +4659,7 @@ enabled openssl           && { check_lib openssl/ssl.h SSL_library_init -lssl -l
                                check_lib openssl/ssl.h SSL_library_init -lssl32 -leay32 ||
                                check_lib openssl/ssl.h SSL_library_init -lssl -lcrypto -lws2_32 -lgdi32 ||
                                die "ERROR: openssl not found"; }
-enabled qtkit_indev      && { check_header QTKit/QTKit.h || disable qtkit_indev; }
+enabled qtkit_indev      && { check_header_oc QTKit/QTKit.h || disable qtkit_indev; }
 
 if enabled gnutls; then
     { check_lib nettle/bignum.h nettle_mpz_get_str_256 -lnettle -lhogweed -lgmp && enable nettle; } ||