Andrew Tridgell ef3d61a80a Ken McDonell from SGI was interested in adding some profiling ...

capabilities to Samba so that Samba could talk to the SGI PCP
(Performance Co-Pilot) apps.

This change adds a profiling shared memory area and uses it to count
two fairly trivial things, the number of uid switches and the number
of SMB packets processes. To add more just edit include/profile.h and
then increment it at the right place.

I've also added a -P switch to smbstatus to dump the profile area.

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locking_shm.c

Reasonably large change to give us *exactly* correct NT delete on close semantics.

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locking_slow.c

Makefile.in: Added maintainer mode fixes.

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locking.c

don't core dump in smbstatus if we can't open the shmem system

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shmem_sysv.c

Ken McDonell from SGI was interested in adding some profiling

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shmem.c

Added the same open()/fopen()/creat()/mmap() -> sys_XXX calls.

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