netbsd: use versioned __msync13 from libc

The system linker shows warning when `msync` is linked instead of `__msync13`:

  "warning: reference to compatibility msync(); include <sys/mman.h> for correct reference"

closes #14422
599b3ef9e9Michael Dusan committed on 1/29/2023, 12:05:38 AM· committed by Andrew Kelleyparent2b27bc2
2 files changedLine totals unavailable