Supress tons of warning regarding "compatibility" on NetBSD

[catap]

When build Scala-Native on NetBSD, you may see tons of warnings like:

[error] /usr/bin/ld: /home/catap/scala-native/unit-tests/native/.3/target/scala-3.4.0/native-test/generated/cbe34aa6.ll.o: in function `M48org.scalanative.testsuite.posixlib.sys.TimesTestD13timesSucceedsuEO':
[error] /home/catap/scala-native/unit-tests/native/src/test/scala/org/scalanative/testsuite/posixlib/sys/TimesTest.scala:48: warning: warning: reference to compatibility times(); include <sys/times.h> for correct reference
[error] /usr/bin/ld: /home/catap/scala-native/unit-tests/native/.3/target/scala-3.4.0/native-test/generated/6cb3a268.ll.o: in function `M43org.scalanative.testsuite.posixlib.GlobTestD29globExpectNotFound$$anonfun$1L29scala.scalanative.unsafe.ZoneiEPT43org.scalanative.testsuite.posixlib.GlobTest':
[error] /home/catap/scala-native/unit-tests/native/src/test/scala/org/scalanative/testsuite/posixlib/GlobTest.scala:83: warning: warning: reference to compatibility glob(); include <glob.h> for correct reference
[error] /usr/bin/ld: /home/catap/scala-native/unit-tests/native/src/test/scala/org/scalanative/testsuite/posixlib/GlobTest.scala:93: warning: warning: refer

An example of header which triggers it: https://github.com/NetBSD/src/blob/dd848dec1a6e0b1e98e1d18ce6d271225ebc2057/lib/libc/compat/gen/compat_times.c#L25

It was discovered as part of #3835