Add support for hash-style=gnu

Change-Id: I171434a587420895feac8a9b1ad2342087197568
Merge "Add support for hash-style=gnu"
Fix mips build

Change-Id: I58b01db38ab9a397a8bd77c1296aac12957c21da
Fix glibc 2.15 build.

glibc 2.15 has prlimit64, has an unsetenv that's declared nonnull,
and hasn't fixed the problems we were having trying to use the
POSIX strerror_r in C++ code.

Change-Id: I834356a385e5ae55500bd86781691b6c1c9c8300
Merge "Fix mips build"
Merge "Fix glibc 2.15 build."