Bug 24423 – Support dmd specific CC environment variable

For Posix it may be a good idea to support a second (with priority) environment variable specific to dmd that acts as $CC does. This can be useful when using dmd as a C compiler (where dmd still needs the C compiler to link). That way you can do this, instead of modifying the build script wrt. the compiler itself. ```sh DMD_CC=$CC CC=dmd ``` https://forum.dlang.org/thread/[email protected]

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