Debug:Qutex: Add deadlock detection based on elapsed time

We now detect that a deadlock is likely when
CONFIG_DEBUG_QUTEX_DEADLOCK_TIMEOUT_MS has elapsed. This is the
preliminary work required to do a backtrace through the call
stack and figure out if a deadlock has really occured.

To do this, we'd have to go through the async call chain and
search for a previous caller which acquired the same qutex as
the one that first failed during this Lockvoker LockSet acquisition
attempt.

include/config.h.in

@@ -12,6 +12,9 @@
 /* World thread configuration */
 #cmakedefine WORLD_USE_BODY_THREAD
 
+/* Qutex deadlock detection configuration */
+#define DEBUG_CONFIG_QUTEX_DEADLOCK_TIMEOUT_MS @DEBUG_CONFIG_QUTEX_DEADLOCK_TIMEOUT_MS@
+
 /* Cross-compilation configuration */
 #cmakedefine CMAKE_CROSSCOMPILING