Michael Dusan 0b47e69b7c improve header searchlist handling in build, main
build.zig:
- use "-I" instead of "-isystem" for `b.addSearchPrefix()`

main.zig:
- silently ignore superfluous search dirs
- warn when a dir is added to multiple searchlists
- consolidate "expected paramter after {s}" fatal error messages
- rename command-line switch `-dirafter` → `-idirafter`

closes #12888
2022-10-12 13:50:25 -04:00
..
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