gn-native: introduce recipe

Add host variant of the Google's GN meta-build system tool.
Similarly to cmake, GN generates Ninja files for the final compilation.

Closes: https://git.ostc-eu.org/OSTC/OHOS/meta-ohos/-/issues/63



Signed-off-by: Robert Drab <robert.drab@huawei.com>

meta-ohos-staging/recipes-devtools/gn/gn-native_git.bb

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+SUMMARY = "Meta-build system that generates build files for Ninja"
+LICENSE = "BSD-3-Clause & Unicode"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=0fca02217a5d49a14dfe2d11837bb34d \
+                    file://src/base/third_party/icu/LICENSE;md5=97cdee8fe9e91b393a616bc13c8081db"
+
+SRC_URI = "git://gn.googlesource.com/gn.git;protocol=https"
+
+DEPENDS = "ninja-native"
+
+PV = "0.0+git${SRCPV}"
+SRCREV = "39a87c0b36310bdf06b692c098f199a0d97fc810"
+
+S = "${WORKDIR}/git"
+
+inherit native
+
+do_configure () {
+	python3 build/gen.py --no-strip --out-path ${B}
+}
+
+do_compile () {
+	ninja -C ${B}
+}
+
+do_install () {
+	install -D ${B}/gn ${D}${bindir}/gn
+}