Add @file command line support to gcc/g++ (ported from GCC 4.1)#10

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argasek wants to merge 1 commit intoadtools:masterfrom

argasek:gcc41_atfile_support

Commits on Jan 8, 2015

Add @file command line support (ported from gcc 4.1) to make the compiler useful on CLion. Merge previous patches into current patch.
argasek
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