Threadlib refactoring, phase 1

All constructs, save Mutexes, can carry names.  (Mutexes will carry them
once HMalloc doesn't require a Mutex.)

All constructs are now opaque to the game logic.  Some limited upcalls
will be added in phase 2 so that the game logic can initialize some
thread-local data in a backend-independent way.

DEBUG_TRACK_SEM is gone.  In its place are NAMED_SYNCHRO (which names
synchronization constructs) and TRACK_CONTENTION (which reports when
threads go to sleep because of synchronization constructs.)  Again,
Mutexes are immune.

A lot of conditionally compiled code in the threadlib was collated,
dramatically reducing the number of preprocessing directives.

The exposed (threadlib.h) and backend (sdlthreads.h) APIs match one
another more closely now, further reducing the level of preprocessor
work required.


git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@1255 8092fc87-c524-0410-9efc-e669fe64eaf9

sc2/build/unix/build.config

@@ -59,7 +59,6 @@ CHOICE_debug_OPTION_debug_TITLE="Debugging information"
 CHOICE_debug_OPTION_debug_ACTION='debug_action'
 debug_action() {
 	CFLAGS="$CFLAGS -g -O0 -W -Wall"
-	CFLAGS="$CFLAGS -DDEBUG_TRACK_SEM" # enable semaphore deugging
 	LDFLAGS="$LDFLAGS -O0"
 	DEBUG=1
 }
@@ -67,7 +66,6 @@ CHOICE_debug_OPTION_strictdebug_TITLE="Debug info + strict compile checks"
 CHOICE_debug_OPTION_strictdebug_ACTION='strictdebug_action'
 strictdebug_action() {
 	CFLAGS="$CFLAGS -O1"  # This is needed for -Wunitialized
-	CFLAGS="$CFLAGS -DDEBUG_TRACK_SEM" # enable semaphore debugging
 	CFLAGS="$CFLAGS -W -Wall \
 			-Wbad-function-cast -Wcast-qual -Wmissing-prototypes \
 			-Wstrict-prototypes -Wmissing-declarations \