build: Update known-good for 1.1.108 header

Additionally, moved platform guards to surround
`GetPhysicalDeviceSurfacePresentModes2EXT`

Updated:
- `loader/extension_manual.c`
- `scripts/known_good.json`

Change-Id: I5c5eef6474915f8cb9aeaedcf95e84bb118badfb
diff --git a/loader/extension_manual.c b/loader/extension_manual.c
index e723df9..640db2f 100644
--- a/loader/extension_manual.c
+++ b/loader/extension_manual.c
@@ -398,7 +398,6 @@
     }
     return icd_term->dispatch.GetPhysicalDeviceSurfacePresentModes2EXT(phys_dev_term->phys_dev, pSurfaceInfo, pPresentModeCount, pPresentModes);
 }
-#endif // VK_USE_PLATFORM_WIN32_KHR
 
 VKAPI_ATTR VkResult VKAPI_CALL GetDeviceGroupSurfacePresentModes2EXT(
     VkDevice                                    device,
@@ -429,3 +428,5 @@
     }
     return VK_SUCCESS;
 }
+
+#endif  // VK_USE_PLATFORM_WIN32_KHR
diff --git a/scripts/known_good.json b/scripts/known_good.json
index 9988ea0..feb9a5d 100644
--- a/scripts/known_good.json
+++ b/scripts/known_good.json
@@ -6,7 +6,7 @@
       "sub_dir" : "Vulkan-Headers",
       "build_dir" : "Vulkan-Headers/build",
       "install_dir" : "Vulkan-Headers/build/install",
-      "commit" : "v1.1.107"
+      "commit" : "v1.1.108"
     }
   ],
   "install_names" : {