kbuild: pacman-pkg: package unstripped vDSO libraries

The unstripped vDSO files are useful for debugging.
They are provided in the upstream 'linux-headers' package.

Also package them as part of 'make pacman-pkg'.
Make them part of the '-debug' package, as they fit there best.
This differs from the upstream package as that has no '-debug' variant.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260318-kbuild-pacman-vdso-install-v1-1-48ceb31c0e80@weissschuh.net
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

scripts/package/PKGBUILD

@@ -121,6 +121,9 @@ _package-debug(){
 	install -Dt "${debugdir}" -m644 vmlinux
 	mkdir -p "${builddir}"
 	ln -sr "${debugdir}/vmlinux" "${builddir}/vmlinux"
+
+	echo "Installing unstripped vDSO(s)..."
+	${MAKE} INSTALL_MOD_PATH="${pkgdir}/usr" vdso_install
 }
 
 for _p in "${pkgname[@]}"; do