* fix libc prototypes of offsets to have correct integer sizes and
signedness. This gets all behavior tests to pass for
armv8-linux-musleabihf
* fix linux mmap syscall to have correct integer size and signedness
for offset
* disable failing armv8-linux-musleabihf std lib tests. See 3289. I
suspect compiler-rt issue. Note these tests fail with this target
triple regardless of whether musl is actually linked (-lc).