Recent changes to pthread pre/postcreate and init_main_thread

[Thomas Pfaff <tpfaff at gmx dot net>]

Chris,

while i can understand the reasons for your changes to the code i am not 
happy whith these regarding the cancel event creation:

Doing it in postcreate after a thread is already created is nonsense 
since it is a requisite and will lead to a segmentation fault if the 
cancel event creation fails for some reason.

Apart from this i will not longer maintain the pthreads stuff.
My reasons are:

1. Time
I have not enough time left for reading the cygwin ml, developing 
pthread improvements (like POSIX Message queues), doing bug fixes ...
My family and my job already consume too much.

2. Motivation
The latest cygwin release does all that i need after i backported my 
last pthread bugfixes. And there has been no reason to boot windows on 
my home box for the last 2 month and it will possibly get deleted in the 
near future. Maybe i will keep it just for some games for my daughter.

This does not mean that i will entirely disappear, but everything that i 
have to add and change will go through the cygwin-patches ml again.

Regards,
Thomas