tools: enable meson and ninja build

tools/Makefile

@@ -27,7 +27,7 @@ tools-$(BUILD_TOOLCHAIN) += gmp mpfr mpc libelf
 tools-y += m4 libtool autoconf automake flex bison pkg-config sed mklibs zlib lzo
 tools-y += sstrip make-ext4fs e2fsprogs mtd-utils mkimage util-linux btrfs-progs
 tools-y += firmware-utils patch-image patch quilt yaffs2 flock padjffs2
-tools-y += mm-macros missing-macros xz cmake scons bc findutils gengetopt patchelf boot-format
+tools-y += mm-macros missing-macros xz cmake scons bc findutils gengetopt patchelf boot-format ninja meson
 tools-$(CONFIG_TARGET_orion_generic) += wrt350nv2-builder upslug2
 tools-$(CONFIG_powerpc) += upx
 tools-$(CONFIG_TARGET_x86) += qemu