abuild: use pigz to compress control.tar.gz and manpages

abuild.in

@@ -1500,7 +1500,7 @@ create_apks() {
 		# control.tar.gz
 		cd "$dir"
 		tar -f - -c $(cat "$dir"/.metafiles) | abuild-tar --cut \
-			| gzip -9 > control.tar.gz
+			| $gzip -9 > control.tar.gz
 		abuild-sign -q control.tar.gz || exit 1
 
 		msg "Create $apk"
@@ -1587,6 +1587,7 @@ check() {
 
 # predefined splitfunc doc
 default_doc() {
+	local gzip=$(command -v pigz || echo gzip)
 	depends="$depends_doc"
 	pkgdesc="$pkgdesc (documentation)"
 	install_if="docs $pkgname=$pkgver-r$pkgrel"
@@ -1629,7 +1630,7 @@ default_doc() {
 			fi
 		done
 
-		[ $islink -eq 0 ] && gzip -9 "$name"
+		[ $islink -eq 0 ] && $gzip -9 "$name"
 	done
 
 	rm -f "$subpkgdir/usr/share/info/dir"