Add coarse-grained locking to pkgsrc builds, by means of a beefed

up version of the bare-bones code in PR 7590, from David Maxwell.

The definition governing the type of locking used is PKGSRC_LOCKTYPE,
which can take any of the values "none", "sleep", and "once".  The
default is "none".  If "sleep" locking is used, and process A is
building a package, when process B attempts to build the same package,
process B will sleep for PKGSRC_SLEEPSECS seconds, and attempt to grab
the lock again.

Coarse-grained locking uses the OBJHOSTNAME definition to ensure that
the PID space is regular for shlock(1) to do its work.  The
pkgsrc/pkgtools/shlock package has been provided for environments
where shlock is not standard.

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