Log Message:
Changes 3.1:
Add AArch64 (ARM64) iOS support.
Add Nios II support.
Add m88k and DEC VAX support.
Add support for stdcall, thiscall, and fastcall on non-Windows
  32-bit x86 targets such as Linux.
Various Android, MIPS N32, x86, FreeBSD and UltraSPARC IIi fixes.
Make the testsuite more robust: eliminate several spurious
  failures, and respect the $CC and $CXX environment variables.
Archive off the manually maintained ChangeLog in favor of git log.