glibc: Fix cannot open locale definition file `C'
glibc25 2.5.1: New formula for Linuxbrew

CentOS 5 ships with glibc 2.5
Linuxbrew: Do not set the rpath of glibc25
libxslt: Add --without-crypto for Linuxbrew

Added --without-crypto to configure options to avoid a dependency on libgcrypt.

Closes #147