main/postmarketos-mkinitfs: use cross-native2 (MR 6297)

Speed up cross compilation.

Related: https://docs.postmarketos.org/pmbootstrap/cross_compiling.html

main/postmarketos-mkinitfs/APKBUILD

@@ -2,13 +2,14 @@
 # Co-Maintainer: Clayton Craft <clayton@craftyguy.net>
 pkgname=postmarketos-mkinitfs
 pkgver=2.6.1
-pkgrel=0
+pkgrel=1
 pkgdesc="Tool to generate initramfs images for postmarketOS"
 url="https://postmarketos.org"
 depends="
 	boot-deploy>=0.9
 "
-makedepends="go scdoc"
+makedepends_build="go scdoc"
+options="pmb:cross-native2"
 replaces="mkinitfs"
 
 triggers="$pkgname.trigger=\