Jeremy Allison 74d42644e6 Fix for stacking locks in brlock and POSIX. Windows only allows a read lock ...

to overlay a write lock on the same fnum. When overlaying read locks onto
a write lock, the number of locks is counted, and the first unlock removes
the write lock and downgrades this to a read lock. Do the same when mapping
to POSIX.
Jeremy.

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brlock.c

Fix for stacking locks in brlock and POSIX. Windows only allows a read lock

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locking.c

Added sys_fork() and sys_getpid() functions to stop the overhead

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posix.c

Fix for stacking locks in brlock and POSIX. Windows only allows a read lock

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