std-gnu11: new module
This makes it easier for applications to prefer C11 and C++11 to older variants, when compiling C and C++ code. Unlike most m4/*.m4 files, m4/std-gnu11.m4 is GPLed, as it copies a nontrivial chunk of GPLed Autoconf source code. * COPYING: Mention the m4/*.m4 copyright situation. * MODULES.html.sh (std-gnu11): New module. * m4/std-gnu11.m4, modules/std-gnu11: New files.
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