[D-runtime] [D-Programming-Language/druntime] 7b1a61: remove CC filter for CFLAGS

[GitHub via D-runtime]

  Branch: refs/heads/master
  Home:   https://github.com/D-Programming-Language/druntime
  Commit: 7b1a6110f35fbd358235385b9bb0c56d91bcc084
      https://github.com/D-Programming-Language/druntime/commit/7b1a6110f35fbd358235385b9bb0c56d91bcc084
  Author: Martin Nowak <code at dawg.eu>
  Date:   2015-09-06 (Sun, 06 Sep 2015)

  Changed paths:
    M posix.mak

  Log Message:
  -----------
  remove CC filter for CFLAGS

- allows to use compiler wrappers
- fixes make CC=/path/to/cc
- fixes Issue 15012
- still can be overriden with make CFLAGS=


  Commit: b83f84e8c2d79617120fcea3a3bc0a6091ee6e5d
      https://github.com/D-Programming-Language/druntime/commit/b83f84e8c2d79617120fcea3a3bc0a6091ee6e5d
  Author: Vladimir Panteleev <github.private at thecybershadow.net>
  Date:   2015-09-06 (Sun, 06 Sep 2015)

  Changed paths:
    M posix.mak

  Log Message:
  -----------
  Merge pull request #1378 from MartinNowak/master

filter on basename of compilers


Compare: https://github.com/D-Programming-Language/druntime/compare/acb86115d1d1...b83f84e8c2d7