pgsql-server: win32 doesn't support a static initializer for mutexes,

Log Message:
-----------
win32 doesn't support a static initializer for mutexes, thus the first
user must initialize the lock. The problem are concurrent "first" users
- the pthread_mutex_t initialization must be synchronized.
The current implementation is broken, the attached patches fixes that:
mutex_initlock is a spinlock. If the pthread_mutex_t mutex is not
initialized, then the spinlock is acquired, if the pthread_mutex_t is
initialized if it's not yet initialized and then the spinlock is
dropped.

Manfred Spraul

Modified Files:
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pgsql-server/src/interfaces/libpq:
fe-connect.c (r1.275 -> r1.276)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/libpq/fe-connect.c.diff?r1=1.275&r2=1.276)
fe-secure.c (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/libpq/fe-secure.c.diff?r1=1.42&r2=1.43)