Add ID of blocking thread and friendly error message to critical section timeout

[Mike Hearn]

Hi, inspired by the reassuring noises Gaim makes when it segfaults, here
is a patch to make Wine give users some tips when a critical section
times out. We should probably do the same for when winedbg is triggered
by an exception. If it's too annoying we can have them toggled on/off at
configure time, so packages meant for end users can include them, and
developer builds do not.

ChangeLog:
Human readable explanation in RtlpWaitForCriticalSection
Add the ID of the blocking thread to the error message
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