std.zig.system: use both PATH and hardcoded locations to find env
#21540
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Should help systems that have main
env
binary in different location than hardcoded/usr/bin/env
during build (not neccessarily always), like Nix/Guix, Termux, Gentoo Prefix etc.Theoretically should close following issues, but it needs more testing from affected users:
#12156
#14146
#14577
#15898
Source for logic: #14146 (comment)