Remove function argument name from posix_spawnattr_getsigmask()
prototype to match other prototypes in the file. OK guenther@ deraadt@

Remove excessive sys/cdefs.h inclusion
ok guenther millert kettenis

Implement execvpe(3) and posix_spawn(3) and family. Based on
FreeBSD's implementation via Frank Denis, with various cleanups and
tweaks by me.

ok deraadt@, guenther@; discussions and tweaks from ma

Implement execvpe(3) and posix_spawn(3) and family. Based on
FreeBSD's implementation via Frank Denis, with various cleanups and
tweaks by me.

ok deraadt@, guenther@; discussions and tweaks from many others
jmc@ promises to help me further with the man pages in tree

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