Fix msvc build#2

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sebres wants to merge 3 commits intovkholodkov:masterfrom

sebres:fix-msvc-build

Commits on Jan 4, 2023

fixes build with msvc (missing ftruncate/strncasecmp)
sebres
committed
named location starts with @ only (don't segfault on empty location)
sebres
committed
more msvc related fixes, suppress warnings, several small nginx compat tweaks
sebres
committed