Add a patch to fix build with BSD grep

Since this is not the default, no need to bump portrevision.

PR:		228673
Submitted by:	Stefan Esser

graphics/mesa-dri/files/patch-configure

@@ -51,6 +51,22 @@
      dri3_default=yes
      ;;
  *)
+@@ -26765,13 +26765,13 @@
+     have_vdpau_platform=no
+ fi
+ 
+-if echo $platforms | grep -q "x11\|drm"; then
++if echo $platforms | egrep -q "x11|drm"; then
+     have_omx_platform=yes
+ else
+     have_omx_platform=no
+ fi
+ 
+-if echo $platforms | grep -q "x11\|drm\|wayland"; then
++if echo $platforms | egrep -q "x11|drm|wayland"; then
+     have_va_platform=yes
+ else
+     have_va_platform=no
 @@ -27096,9 +27106,6 @@ rm -f core conftest.err conftest.$ac_obj
          CLANG_LIBDIR=${LLVM_LIBDIR}
      fi