check if function exists, some older versions don't have this

svn path=/icecast/trunk/icecast/; revision=14825

configure.in

@@ -102,6 +102,7 @@ XIPH_VAR_PREPEND([XIPH_LIBS],[$PTHREAD_LIBS])
 XIPH_PATH_CURL([
     AC_CHECK_DECL([CURLOPT_NOSIGNAL],
         [ AC_DEFINE([HAVE_AUTH_URL], 1, [Define to compile in auth URL support code])
+        AC_CHECK_FUNCS([curl_global_init])
         ICECAST_OPTIONAL="$ICECAST_OPTIONAL auth_url.o"
         enable_curl="yes"
         XIPH_VAR_APPEND([XIPH_CPPFLAGS],[$CURL_CFLAGS])

src/main.c

@@ -110,8 +110,10 @@ static void _initialize_subsystems(void)
 #if !defined(WIN32) || defined(WIN32_SERVICE)
     /* win32 GUI needs to do the initialise before here */
     xslt_initialize();
+#ifdef HAVE_CURL_GLOBAL_INIT
     curl_global_init (CURL_GLOBAL_ALL);
 #endif
+#endif
 }
 
 static void _shutdown_subsystems(void)