To be the same as bionic's. See
ec37237d69289e2bb9836bfa0d071ab958234d00
The new one also no longer undef offsetof and replaces it with
"((size_t) &((TYPE *)0)->MEMBER)" if __compiler_offsetof isn't
defined. The problem with the old behavior are that
1. __compiler_offsetof isn't defined in linux/compiler.h even though
all Android compilers support __builtin_offsetof
2. As as result, offsetof defined in stddef.h to use __builtin_offsetof
is undefined and replaced here. Problem is,
"((size_t) &((TYPE *)0)->MEMBER)" isn't considered a compile-time
constant, and fails some code expect offsetof to be.
Change-Id: I3ebb0de9e1d95305a0890a099360ff6936d24b2f
bbff7fbd64