Bug 780270 - MinGW build fail on Windows (broken m4 macro).
BUILD_EXEEXT was not properly set (config macro AX_PROG_CC_FOR_BUILD). Apparently we need aclocal/automake version 1.13 or higher and to distribute ax_prog_cc_for_build.m4 ourselves to benefit from a fix released only in autoconf 2.69. Thanks to Éric Hoffman for reporting and investigating on this. Automake 1.13 apparently dates from 2012 and debian testing provides a newer version (automake 1.15) so it should be ok to update it. Also that's only a build dependency.
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