Do not explicitly load libc on FreeBSD
Do not explicitly load libc on FreeBSD

On FreeBSD, the versionless `libc.so` file is a (text-based) linker
script and can not be loaded dynamically at runtime. Instead of
hardcoding the libc version "7" for FreeBSD we can just skip the load
completely, since libc is already implicitly loaded by the Chez runtime.

mmhelloworld/idris-jvm,mmhelloworld/idris-jvm,mmhelloworld/idris-jvm,mmhelloworld/idris-jvm,mmhelloworld/idris-jvm,mmhelloworld/idris-jvm