Add packaging scripts for Meson

It probably doesn't belong here but I don't feel like creating another
repository for this either yet.

meson/packaging/make-pacman.sh

@@ -0,0 +1,22 @@
+#!/bin/sh -e
+cd "$MESON_BUILD_ROOT"
+. "$MESON_SUBDIR/meta"
+wd="`pwd`/`mktemp -d pacman.XXXXXX`"
+trap "rm -rf '$wd'" INT QUIT TERM EXIT
+
+target="$name-$version-$arch.tar.xz"
+fakeroot sh -e <<-EOF
+	DESTDIR="$wd" ninja install
+	cat > "$wd/.PKGINFO" <<END
+	pkgname = $name
+	pkgver = $version-1
+	pkgdesc = $summary
+	url = $url
+	builddate = \`date -u +%s\`
+	packager = $author
+	size = \`du -sb --apparent-size | cut -f1\`
+	arch = $arch
+	END
+	cd "$wd" && tar cJf "../$target" .PKGINFO *
+	echo Written $target
+EOF