Use correct type in call to glGetQueryObjectui64v

indra/llrender/llglslshader.cpp

@@ -273,10 +273,10 @@ void LLGLSLShader::readProfileQuery(U32 count, U32 mode)
     glEndQueryARB(GL_TIME_ELAPSED);
     glEndQueryARB(GL_SAMPLES_PASSED);
     
-    U64 time_elapsed = 0;
+    GLuint64 time_elapsed = 0;
     glGetQueryObjectui64v(mTimerQuery, GL_QUERY_RESULT, &time_elapsed);
 
-    U64 samples_passed = 0;
+    GLuint64 samples_passed = 0;
     glGetQueryObjectui64v(mSamplesQuery, GL_QUERY_RESULT, &samples_passed);
 
     sTotalTimeElapsed += time_elapsed;