Log Message:
Extend removing -Werror to all compilers, not just clang. Fixes build
with gcc48 on amd64; also closes PR 36974 relating to -Wcast-align on
arm and other non-x86 platforms.

Whether the offending code *works* on non-x86 platforms isn't clear,
but it might and someone will eventually have to try it out. If it
doesn't, please try to get upstream to fix it as the code probably
needs fundamental restructuring.