eudev: create input group (gid 25), some udev rules expect this.

srcpkgs/eudev/template

@@ -4,7 +4,7 @@ _UDEV_VERSION="214" # compatible udev version provided
 
 pkgname=eudev
 version=1.8
-revision=1
+revision=2
 conf_files="/etc/udev/udev.conf"
 conflicts="systemd>=0"
 build_style=gnu-configure
@@ -18,6 +18,9 @@ homepage="http://www.gentoo.org/proj/en/eudev/"
 distfiles="http://dev.gentoo.org/~blueness/eudev/eudev-${version}.tar.gz"
 checksum=fb7d4d98e6c91cf0354c3b702b5919d1caac5f50d1fc64b33f5854dd68792010
 
+# Some udev rules expect an 'input' group.
+system_groups="input:25"
+
 # Package build options
 build_options="gir"
 desc_option_gir="Enable support for building gobject introspection data"