Change GetProcAddr  function signature to use XGL types.

Fix bug in GPA for basic_plugin.c .
diff --git a/icd/intel/intel.c b/icd/intel/intel.c
index db9c860..7321e4b 100644
--- a/icd/intel/intel.c
+++ b/icd/intel/intel.c
@@ -80,7 +80,7 @@
     intelSetDispatch(disp, debug);
 }
 
-ICD_EXPORT void * xglGetProcAddr(XGL_PHYSICAL_GPU gpu, const XGL_CHAR * pName)
+ICD_EXPORT XGL_VOID * xglGetProcAddr(XGL_PHYSICAL_GPU gpu, const XGL_CHAR * pName)
 {
     return intelGetProcAddr(gpu, pName);
 }