add pipeline cache flag bits in simplevk.h

Author: CLV-Iclucia

src/simplevk.h

@@ -1097,6 +1097,12 @@ typedef enum VkCommandBufferResetFlagBits
 } VkCommandBufferResetFlagBits;
 typedef VkFlags VkCommandBufferResetFlags;
 
+typedef enum VkPipelineCacheCreateFlagBits {
+    VK_PIPELINE_CACHE_CREATE_EXTERNALLY_SYNCHRONIZED_BIT = 0x00000001,
+    VK_PIPELINE_CACHE_CREATE_INTERNALLY_SYNCHRONIZED_MERGE_BIT_KHR = 0x00000008,
+    VK_PIPELINE_CACHE_CREATE_EXTERNALLY_SYNCHRONIZED_BIT_EXT = VK_PIPELINE_CACHE_CREATE_EXTERNALLY_SYNCHRONIZED_BIT,
+} VkPipelineCacheCreateFlagBits;
+
 typedef struct VkApplicationInfo
 {
     VkStructureType sType;