Parallelize building gnu/usr.bin/groff
This speeds up building the directory from the bootstrap-tools stage in buildworld as well as building from the subdirectory
Based on a patch submitted via -arch: https://lists.freebsd.org/pipermail/freebsd-arch/2014-December/016493.html
MFC after: 1 week Submitted by: Jia-Shiun Li <jiashiun@gmail.com> Sponsored by: EMC / Isilon Storage Division
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