scripts: unquoted variable reference in glibc-eglibc.sh-common

Signed-off-by: Daniel Price <daniel.price@gmail.com>
Message-Id: <12f092a95a94bcf76912.1353367250@redfish.dssd.com>
Patchwork-Id: 200215

 # windows config options

 ## depends on EXPERIMENTAL && ARCH_x86

 ##

 ## select WINDOWS

 ##

 ## help Build a toolchain targeting systems running Windows as host