configure: Use WAYLAND_SCANNER_RULES only if available

This has the drawback that when creating configure for
distribution, wayland needs to be available for the packager.

Also the the macros has the wayland prefix hardcoded, so
we cant copy it in mesa right now.

diff --git a/configure.ac b/configure.ac
index 59919f0..c9e658c 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1710,7 +1710,8 @@ yes)
                                  [AC_MSG_ERROR([cannot find libwayland-client])])
                 GALLIUM_WINSYS_DIRS="$GALLIUM_WINSYS_DIRS sw/wayland"
 
-                WAYLAND_SCANNER_RULES(['$(top_srcdir)/src/egl/wayland/wayland-drm/protocol'])
+                m4_ifdef([WAYLAND_SCANNER_RULES],
+                         [WAYLAND_SCANNER_RULES(['$(top_srcdir)/src/egl/wayland/wayland-drm/protocol'])])
        fi
         if test "$plat" = "drm" && test "x$enable_gbm" = "xno"; then
                 AC_MSG_ERROR([EGL platform drm needs gbm])