[cairo] Bug in cairo-mutex.c

[Hans-Jürgen Schäler]

Hallo!

I have found a bug in cairo-mutex.c.
The bug occures when HAVE_PTHREAD_H is not set.
(This is the case if you create a version of cairo with MSC.)

1. The list of mutexes that must be initialized is not set because
   the #define CAIRO_MUTEX_LIST_PRIVATE_H prevents the 2nd read of
   cairo-mutex-list-private.h.

2. In the case of MSC CAIRO_MUTEX_INIT() needs the adress of the mutex
   instead of the mutex itself.
   (Im am not sure if this is right in all cases.)

3. _cairo_mutex_initialized is not set to TRUE after initializing all
   mutexes.
   Consequence: It can happen that a mutex is initialized after setting the
   lock.

Also some #defines ar missing in cairo-wideint-private.h for MSC.
(See the attached patch: cairo-070419.dif).

Best regards

Hans-Jürgen Schäler
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