With gcc, declare debug_already_initialized() as 'noinline' so
its deliberate uninitialized access stays inside the function and
valgrind can ignore it there.
Expand usage struct with magic numbers and state info.
Add options "noreinit", "nosync", "nomem", "threadID". Remove "dupinit".
Detect address changes. Turn off thread ID tracking by default.
enabled with LDAP_THREAD_DEBUG (cpp macro and environment variable):
Move any ldap_pvt_* definitions from ldap_int_thread.h to ldap_pvt_thread.h.
#define ldap_int_thread_equal/ldap_pvt_thread_equal instead of tpool.c:TID_EQ.
Define some ldap_debug_*_t types, and LDAP_UINTPTR_T, in ldap_int_thread.h.
ldap_int_thread.h/ldap_pvt_thread.h can now be included multiple times, giving
different results depending on whether libldap_r/ldap_thr_debug.h was included.
Add some cleanup and some preprocessor hacks.
#define LDAP_THREAD*_IMPLEMENTATION in libldap_r/*.c, used by ldap_thr_debug.h.
Add PTHREAD_MUTEX_ERRORCHECK/PTHREAD_MUTEX_ERRORCHECK_NP in thr_posix.c.