meson: clean up the native template in nativesdk builds

In a nativesdk build, the native build template should be minimal as it
just needs to ensure that Meson can link with libraries in the SDK's
native sysroot.

Specifically, it shouldn't be passing BUILD_* flags to Meson as these
are for the Yocto build host, not the SDK user.

(From OE-Core rev: f13063d11f1c62152af9ed45cb24f6499262e1a2)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/meson/meson_1.8.0.bb

@@ -86,6 +86,21 @@ cpp_link_args = ${@generate_native_link_template(d)}
 EOF
 }
 
+install_nativesdk_template() {
+    install -d ${D}${datadir}/meson
+
+    cat >${D}${datadir}/meson/meson.native.template <<EOF
+[binaries]
+pkg-config = 'pkg-config-native'
+
+[built-in options]
+c_args = ['-isystem@{OECORE_NATIVE_SYSROOT}${includedir_native}']
+c_link_args = ['-L@{OECORE_NATIVE_SYSROOT}${libdir_native}', '-L@{OECORE_NATIVE_SYSROOT}${base_libdir_native}',]
+cpp_args = ['-isystem@{OECORE_NATIVE_SYSROOT}${includedir_native}']
+cpp_link_args = ['-L@{OECORE_NATIVE_SYSROOT}${libdir_native}', '-L@{OECORE_NATIVE_SYSROOT}${base_libdir_native}',]
+EOF
+}
+
 install_cross_template() {
     install -d ${D}${datadir}/meson
 
@@ -117,7 +132,7 @@ EOF
 }
 
 do_install:append:class-nativesdk() {
-    install_native_template
+    install_nativesdk_template
     install_cross_template
 
     install -d ${D}${SDKPATHNATIVE}/post-relocate-setup.d