configure.ac: give a big warning for missing gnutls

[Austin English]

Not only is it insecure, it breaks several applications when it is missing.

--
-Austin
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diff --git a/configure b/configure
index 937dbdf..bb68c51 100755
--- a/configure
+++ b/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 ;;
diff --git a/configure.ac b/configure.ac
index a425490..32730f3 100644
--- a/configure.ac
+++ b/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 ***