Fix loader paths for "etc" directories.

The previous libdir/confdir patches mistakenly
used /usr/etc rather than /etc as the default
location for configuration files.  This patch
corrects that mistake.

Signed-off-by: James Jones <jajones@nvidia.com>
Tested-by: Liam Middlebrook <lmiddlebrook@nvidia.com>
diff --git a/loader/vk_loader_platform.h b/loader/vk_loader_platform.h
index 72c72bf..dbc4abe 100644
--- a/loader/vk_loader_platform.h
+++ b/loader/vk_loader_platform.h
@@ -79,15 +79,15 @@
 
 #define DEFAULT_VK_DRIVERS_INFO \
     LOCAL_DRIVERS_INFO \
-    "/usr/" SYSCONFDIR VULKAN_ICDCONF_DIR ":" \
+    "/" SYSCONFDIR VULKAN_ICDCONF_DIR ":" \
     "/usr/" DATADIR VULKAN_ICDCONF_DIR
 #define DEFAULT_VK_DRIVERS_PATH \
     LOCAL_DRIVERS_PATH \
     "/usr/" LIBDIR VULKAN_ICD_DIR
 #define DEFAULT_VK_LAYERS_INFO \
     LOCAL_LAYERS_INFO \
-    "/usr/" SYSCONFDIR VULKAN_ELAYERCONF_DIR ":" \
-    "/usr/" SYSCONFDIR VULKAN_ILAYERCONF_DIR ":" \
+    "/" SYSCONFDIR VULKAN_ELAYERCONF_DIR ":" \
+    "/" SYSCONFDIR VULKAN_ILAYERCONF_DIR ":" \
     "/usr/" DATADIR VULKAN_ELAYERCONF_DIR ":" \
     "/usr/" DATADIR VULKAN_ILAYERCONF_DIR
 #define DEFAULT_VK_LAYERS_PATH \