#1 tpinit failures in Tuxedo 8.0

[Brian Foddy]

After several successful tpinit calls, seems
once an apache daemon closes down tpinit
failures start. problem seems caused by
multi-threaded behavior of Tuxedo 8.0.

A patch will be released soon, but a short-term
work around seems to be:

http://edocs.beasys.com/tuxedo/tux80/atmi/pbthr13.htm

"To join an application, a multithreaded Workstation
client must always call
tpinit(3c) with the TPMULTICONTEXTS flag set, even if
the client is running
in single-context mode."

This looks like a new flag that I don't have a predefined
value for, so add something like this to php_tuxedo.c and
then use it in the flags:

REGISTER_LONG_CONSTANT("TUX_TPMULTICONTEXTS",
PMULTICONTEXTS, CONSTANT_FLAG);