configure: Give a warning for missing gnutls.

configure

@@ -11203,7 +11203,7 @@ test -z "$GNUTLS_LIBS" || GNUTLS_LIBS=`echo " $GNUTLS_LIBS" | sed 's/ -L\([^/]\)
 fi
 if test "x$ac_cv_lib_soname_gnutls" = "x"; then :
   case "x$with_gnutls" in
-  x)   as_fn_append wine_notices "|libgnutls ${notice_platform}development files not found, no schannel support." ;;
+  x)   as_fn_append wine_warnings "|libgnutls ${notice_platform}development files not found, no schannel support." ;;
   xno) ;;
   *)   as_fn_error $? "libgnutls ${notice_platform}development files not found, no schannel support.
 This is an error since --with-gnutls was requested." "$LINENO" 5 ;;

configure.ac

@@ -1346,7 +1346,7 @@ then
                 [WINE_CHECK_SONAME(gnutls,gnutls_global_init,,[GNUTLS_CFLAGS=""],[$GNUTLS_LIBS])])],
             [GNUTLS_CFLAGS=""])])
 fi
-WINE_NOTICE_WITH(gnutls,[test "x$ac_cv_lib_soname_gnutls" = "x"],
+WINE_WARNING_WITH(gnutls,[test "x$ac_cv_lib_soname_gnutls" = "x"],
                  [libgnutls ${notice_platform}development files not found, no schannel support.])
 
 dnl **** Check which curses lib to use ***