src: call linux getauxval(AT_SECURE) in SafeGetenv
This commit attempts to fix the following TODO:
// TODO(bnoordhuis) Should perhaps also check whether getauxval(AT_SECURE) is non-zero on Linux.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
src