The recent linker changes broke NaCl support
a month ago, and there are no known users of it.
The NaCl code can always be recovered from the
repository history.
R=adg, r
CC=golang-dev
https://golang.org/cl/3671042
too hard to make it the same everywhere.
still checking for non-zero exit status though.
disable core files while running tests
R=r
http://go/go-review/1026037