Port to glibc 2.24 (pre-release) + ppc64
Inspired by a suggestion by Florian Weimer in: https://sourceware.org/ml/libc-alpha/2016-07/msg00425.html * configure.ac (HAVE_PERSONALITY_ADDR_NO_RANDOMIZE): Rename from HAVE_PERSONALITY_LINUX32, and check for ADDR_NO_RANDOMIZE (the crucial thing) instead of for LINUX32. All uses changed. * src/emacs.c (main) [HAVE_PERSONALITY_ADDR_NO_RANDOMIZE]: Use ADDR_NO_RANDOMIZE from personality.h rather than inventing the flag ourselves. Just set that flag, rather than also setting the persona. When doing it, avoid functions like putenv that may allocate memory.
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