[PATCH] BZ #14782 system async cancellation

[Rich Felker <dalias at aerifal dot cx>]

This patch fixes the unintended and dangerous (calls to
non-async-cancel-safe functions, which could leave locks in corrupt
state if interrupted by cancellation) use of async cancellation mode
in the implementation of system(). As discussed with Carlos in the
nptl/tst-cancel7 thread on this list, the code seems to have been
introduced mechanically along with similar changes in a number of
other files, the rest of which were pure syscalls for which the issue
in this bug report does not apply.

Copyright papers should not be required since this patch is all-red.
:-)

Rich

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