build: Update known-good for 1.1.91 header

This commit includes all necessary changes to the ValidationLayers
repository for updating the known-good to the 1.1.91 header. Included in
this update:
- Rename promoted NVX extensions to NV - Names of functions, enum
values, etc. related to NVX raytracing were changed to NV ray tracing
    Updated:
    - `layers/core_validation.cpp`
    - `layers/core_validation_types.h`
    - `layers/descriptor_sets.cpp`
    - `layers/shader_validation.cpp`
    - `layers/shader_validation.h`
    - `layers/threading.h`
- Fix failing test for 1.1.91 header update - VkLayerTest
`UnrecognizedValueBadFlag` was changed to meet the requirement that if
`waitSemaphoreCount` is greater than 0, `pWaitSemaphores` is a valid
pointer to an array of valid `VkSemaphore` handles and redfines a "bad
flag" due to the addition of pipeline stage flag bit
`VK_PIPELINE_STAGE_ACCELERATION_STRUCTURE_BUILD_BIT_NV`
    Updated:
    - `tests/layer_validation_tests.cpp`
- Propagate `genvk.py` changes from 1.1.91 - Changes to Vulkan-Headers's
`genvk.py` were added to Vulkan-ValidationLayers's `lvl_genvk.py`
    Updated:
    - `scripts/lvl_genvk.py`
- Generate a new `layers/vk_validation_error_messages.h`
    Updated:
    - `layers/vk_validation_error_messages.h`
- Update known-good for 1.1.91 header
    Updated:
    - `build-android/known_good.json`
    - `scripts/known_good.json`
diff --git a/scripts/known_good.json b/scripts/known_good.json
index 94bc29f..0723b27 100644
--- a/scripts/known_good.json
+++ b/scripts/known_good.json
@@ -20,7 +20,7 @@
       "sub_dir" : "Vulkan-Headers",
       "build_dir" : "Vulkan-Headers/build",
       "install_dir" : "Vulkan-Headers/build/install",
-      "commit" : "46979500a03de8ec5d5cc65b8a090a8b99eb190a"
+      "commit" : "369e6ea7f9b8cf0155b183da7e5be1b39ef6138d"
     },
     {
       "name" : "Vulkan-Loader",
@@ -28,7 +28,7 @@
       "sub_dir" : "Vulkan-Loader",
       "build_dir" : "Vulkan-Loader/build",
       "install_dir" : "Vulkan-Loader/build/install",
-      "commit" : "786bfe7ce231046649479019ca4b654be370287f",
+      "commit" : "9f59673982ff0ef7614adbe4c698b79aef1eaedb",
       "deps" : [
         {
           "var_name" : "VULKAN_HEADERS_INSTALL_DIR",
@@ -45,7 +45,7 @@
       "sub_dir" : "VulkanTools",
       "build_dir" : "VulkanTools/build",
       "install_dir" : "VulkanTools/build/install",
-      "commit" : "e9208b7d492ca7777041219c75a5a6b23bdd5e44",
+      "commit" : "d0f06ee23713c429de3461d6e87ddc5d64e1e726",
       "deps" : [
         {
           "var_name" : "VULKAN_HEADERS_INSTALL_DIR",
@@ -83,7 +83,7 @@
       "sub_dir" : "Vulkan-Tools",
       "build_dir" : "Vulkan-Tools/build",
       "install_dir" : "Vulkan-Tools/build/install",
-      "commit" : "95cc5130b4403594ffd896ed10e989232dd9c27f",
+      "commit" : "1f0e4f47065e2c0efc822112fd0dd30ce3d85b40",
       "deps" : [
         {
           "var_name" : "VULKAN_HEADERS_INSTALL_DIR",
diff --git a/scripts/lvl_genvk.py b/scripts/lvl_genvk.py
index f0dfe4d..156525c 100644
--- a/scripts/lvl_genvk.py
+++ b/scripts/lvl_genvk.py
@@ -21,11 +21,11 @@
 
 def startTimer(timeit):
     global startTime
-    startTime = time.clock()
+    startTime = time.process_time()
 
 def endTimer(timeit, msg):
     global startTime
-    endTime = time.clock()
+    endTime = time.process_time()
     if (timeit):
         write(msg, endTime - startTime, file=sys.stderr)
         startTime = None