[PATCH v2] configure: use cc/c++ instead of gcc/g++

[David Bremner]

Fraser Tweedale <frase at frase.id.au> writes:

> Some systems (e.g. FreeBSD 10) do not ship with the GNU Compiler
> Collection.  Use generic cc/c++ instead of gcc/g++ (unless the
> CC/CXX environment variables are used).

pushed to master.

d