package/pkg-meson: ensure the global cross-compilation.conf file is correct

Currently, the cross-compilation.conf installed in
$(HOST_DIR)/etc/meson/cross-compilation.conf for use by the SDK is
generated in a post-install-staging hook of the toolchain package.

With per-package directory support enabled, this means that the
generated cross-compilation.conf contains references to the
per-package directory of the toolchain/ package, which is not want we
want:

[binaries]
c = '/home/thomas/projets/buildroot/output/per-package/toolchain/host/bin/arm-linux-gcc'
cpp = '/home/thomas/projets/buildroot/output/per-package/toolchain/host/bin/arm-linux-g++'
ar = '/home/thomas/projets/buildroot/output/per-package/toolchain/host/bin/arm-linux-ar'
strip = '/home/thomas/projets/buildroot/output/per-package/toolchain/host/bin/arm-linux-strip'
pkgconfig = '/home/thomas/projets/buildroot/output/per-package/toolchain/host/usr/bin/pkg-config'

So instead, we generate this file in TOOLCHAIN_TARGET_FINALIZE_HOOKS,
so that the global paths are used:

[binaries]
c = '/home/thomas/projets/buildroot/output/host/bin/arm-linux-gcc'
cpp = '/home/thomas/projets/buildroot/output/host/bin/arm-linux-g++'
ar = '/home/thomas/projets/buildroot/output/host/bin/arm-linux-ar'
strip = '/home/thomas/projets/buildroot/output/host/bin/arm-linux-strip'
pkgconfig = '/home/thomas/projets/buildroot/output/host/usr/bin/pkg-config'

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Reviewed-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/pkg-meson.mk

@@ -205,4 +205,4 @@ define PKG_MESON_INSTALL_CROSS_CONF
 	    > $(HOST_DIR)/etc/meson/cross-compilation.conf
 endef
 
-TOOLCHAIN_POST_INSTALL_STAGING_HOOKS += PKG_MESON_INSTALL_CROSS_CONF
+TOOLCHAIN_TARGET_FINALIZE_HOOKS += PKG_MESON_INSTALL_CROSS_CONF