mesa: fix build

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/graphics/mesa/build

@@ -92,6 +92,18 @@ DRI_DRIVER_SEARCH_DIR="$XORG_PATH_DRI" \
             --with-dri-drivers="$DRI_DRIVERS" \
             --with-x \
 
+make CC="$HOST_CC" \
+     CXX="$HOST_CXX" \
+     CFLAGS="$HOST_CFLAGS" \
+     CXXFLAGS="$HOST_CXXFLAGS" \
+     LDFLAGS="$HOST_LDFLAGS" \
+     -C src/glsl builtin_compiler
+
+cp src/glsl/builtin_compiler $ROOT/$TOOLCHAIN/bin
+make -C src/glsl clean
+
+sed -e "s#\.\/builtin_compiler#$ROOT/$TOOLCHAIN/bin/builtin_compiler#g" -i src/glsl/Makefile
+
 make
 
 $MAKEINSTALL