headers: Update to Vulkan header version 1.1.99

Updated:
- `include/vulkan/vulkan.hpp`
- `include/vulkan/vulkan_core.h`
- `registry/genvk.py`
- `registry/validusage.json`
- `registry/vk.xml`

registry/genvk.py

@@ -30,12 +30,13 @@ startTime = None
 
 def startTimer(timeit):
     global startTime
-    startTime = time.process_time()
+    if timeit:
+        startTime = time.process_time()
 
 def endTimer(timeit, msg):
     global startTime
-    endTime = time.process_time()
-    if (timeit):
+    if timeit:
+        endTime = time.process_time()
         write(msg, endTime - startTime, file=sys.stderr)
         startTime = None