filesystem: Do not override nsswitch.conf modified by user.

filesystem/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=filesystem
 pkgver=2015.03
-pkgrel=1
+pkgrel=2
 pkgdesc='Base filesystem'
 arch=('i686' 'x86_64')
 license=('BSD')
@@ -11,7 +11,8 @@ groups=('base')
 provides=('msys2-base')
 replaces=('msys2-base')
 backup=('etc/fstab' 'etc/shells' 'etc/profile'
-        etc/bash.bash{rc,_logout} etc/skel/.bash{rc,_profile,_logout})
+        etc/bash.bash{rc,_logout} etc/skel/.bash{rc,_profile,_logout}
+        etc/nsswitch.conf)
 source=('bash.bash_logout'
         'bash.bashrc'
         'cmd'