Merge pull request #940 from Dicebot/revert-745

[REG 2.066] Fix 13399 "va_arg is nothrow yet may throw "
Merge pull request #945 from klamonte/master

13377 - include core/sys/posix/syslog.d
Merge pull request #944 from 9rnsr/2.066

Cherry-picking commits from master to 2.066 branch (for the minor release 2.066.1)