main/mobile-config-firefox: add subpackage for librewolf (MR 6270)

[ci:skip-build]: already built successfully in CI

main/mobile-config-firefox/APKBUILD

 # Maintainer: Oliver Smith <ollieparaoid@postmarketos.org>
 pkgname=mobile-config-firefox
 pkgver=4.4.0
-pkgrel=0
+pkgrel=1
 pkgdesc="Firefox tweaks for mobile and privacy"
 url="https://gitlab.postmarketos.org/postmarketOS/mobile-config-firefox"
 source="
@@ -10,6 +10,7 @@ source="
 arch="noarch"
 license="GPL-3.0-or-later"
 options="!check" # No tests
+subpackages="$pkgname-librewolf"
 
 build() {
 	make
@@ -18,7 +19,13 @@ build() {
 package() {
 	make DESTDIR="$pkgdir" FIREFOX_DIR=/usr/lib/firefox install
 	make DESTDIR="$pkgdir" FIREFOX_DIR=/usr/lib/firefox-esr install
+	make DESTDIR="$pkgdir" FIREFOX_DIR=/usr/lib/librewolf install
 }
+
+librewolf() {
+	amove /usr/lib/librewolf
+}
+
 sha512sums="
 eb9d5cffe6d57e05659da36b587c2fd77184da45fd1a629938bdf49214c885af9e62d1bcf1ae3eca1a98a6ba06602d0236d95ecdba7798f9432473580c4192ee  mobile-config-firefox-4.4.0.tar.bz2
 "