Fixes the following security vulnerabilities:
CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
corruption when they were passed a pseudo-zero argument. Reported by Guido
Vranken / ForAllSecure Mayhem.
CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
out-of-bounds write when executed in a signal frame context.
CVE-2020-1752: A use-after-free vulnerability in the glob function when
expanding ~user has been fixed.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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