testing/pam_mount: rebuild against pam under /usr/lib

testing/pam_mount/APKBUILD

@@ -1,7 +1,7 @@
 # Maintainer: John Vogel <jvogel@stygian.me>
 pkgname=pam_mount
 pkgver=2.20
-pkgrel=2
+pkgrel=3
 pkgdesc="Pluggable Authentication Module that can mount volumes for a user session"
 url="https://codeberg.org/jengelh/pam_mount"
 arch="all"
@@ -33,6 +33,7 @@ build() {
 		--sysconfdir=/etc \
 		--localstatedir=/var \
 		--with-rundir=/run \
+		--with-slibdir=/usr/lib \
 		--disable-dependency-tracking
 	make
 }