Stop using linux_getpgid(). The implementation at this time is broken and fixing it only creates a duplicate of what is already in the FreeBSD kernel. Therefore, map the syscall directly to getpgid().
Stop using linux_getpgid(). The implementation at this time is
broken and fixing it only creates a duplicate of what is already
in the FreeBSD kernel. Therefore, map the syscall directly to
getpgid().

PR: kern/21402
Submitted by: Christian Weisgerber <naddy@mips.inka.de>

While here, redefine the second entry for setpgid() so that we
don't need a stub. This is achieved by giving the second instance
the type NODEF.

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