bash: also match linux-gnueabi

Needed for Abacus, which is an armv5tel box.

ostype:
.gnu.ostype = linux-gnueabi
.uname.kernel = Linux
.uname.release = 3.2.0-2-kirkwood
.uname.version = #1 Wed Mar 14 16:21:16 UTC 2012
.perl.osname = linux
.perl.osvers = 2.6.32
.python.platform = linux2
arch:
.gnu.hosttype = arm
.gnu.machtype = arm-unknown-linux-gnueabi
.uname.machine = armv5tel
.uname.processor = unknown
.cc.dumpmachine = arm-linux-gnueabi
.perl.arch = arm-linux-gnueabi-thread-multi-64int