language-c-inline.cabal : Add Ghc-Options.

Add "-Wall -fwarn-tabs -fno-warn-incomplete-patterns".
Language : Initial rough hack to support plain C.

A lot of refactoring still needed. Since ObjC is a strict superset
of plain C, the ObjC code should probably re-user large chunks of
code from plain C.
Initial test suite for Posix-C.

The Posix-C test suite should also JustWork (tm) on OSX.