xgl:  Remove XGL_* typedef wrappers

Part of moving to xgl.h rev#38, svn rev 29293-29302
diff --git a/icd/intel/gpu.c b/icd/intel/gpu.c
index 0b65ed6..d5b33ea 100644
--- a/icd/intel/gpu.c
+++ b/icd/intel/gpu.c
@@ -452,8 +452,8 @@
 ICD_EXPORT XGL_RESULT XGLAPI xglGetGpuInfo(
     XGL_PHYSICAL_GPU                            gpu_,
     XGL_PHYSICAL_GPU_INFO_TYPE                  infoType,
-    XGL_SIZE*                                   pDataSize,
-    XGL_VOID*                                   pData)
+    size_t*                                     pDataSize,
+    void*                                       pData)
 {
     const struct intel_gpu *gpu = intel_gpu(gpu_);
     XGL_RESULT ret = XGL_SUCCESS;
@@ -513,7 +513,7 @@
 
 ICD_EXPORT XGL_RESULT XGLAPI xglGetExtensionSupport(
     XGL_PHYSICAL_GPU                            gpu_,
-    const XGL_CHAR*                             pExtName)
+    const char*                                 pExtName)
 {
     struct intel_gpu *gpu = intel_gpu(gpu_);
     const enum intel_ext_type ext = intel_gpu_lookup_extension(gpu, pExtName);