main/wireguard-postmarketos-stable: fix arch

Change arch line to same as linux-postmarketos-stable (so the current
build scripts won't attempt to build linux-postmarketos-stable for
armv7).

main/wireguard-postmarketos-stable/APKBUILD

@@ -14,7 +14,7 @@ pkgname=wireguard-${_flavor}
 pkgver=4.18.4
 pkgrel=0
 pkgdesc="Next generation secure network tunnel: kernel modules for $_flavor"
-arch=all
+arch="x86_64 armhf aarch64"
 url='https://www.wireguard.com'
 license="GPL-2.0"
 depends="linux-postmarketos-stable"
@@ -43,4 +43,4 @@ package() {
 	done
 }
 
-sha512sums="2278cae078cf3ff9e0c43979ff559820d9d99b64c1ccdbc8a7fea3fc1a5fa0818d782a8962aefc07678599cc15f5a4237fd5dd7ffad108d639c39930979e3cc5  WireGuard-0.0.20180809.tar.xz"
\ No newline at end of file
+sha512sums="2278cae078cf3ff9e0c43979ff559820d9d99b64c1ccdbc8a7fea3fc1a5fa0818d782a8962aefc07678599cc15f5a4237fd5dd7ffad108d639c39930979e3cc5  WireGuard-0.0.20180809.tar.xz"