Fix initialization of OpenGL on OSX, closes #601

Author: johguenther

apps/ospExamples/GLFWOSPRayWindow.cpp

@@ -164,7 +164,7 @@ GLFWOSPRayWindow::GLFWOSPRayWindow(
 
   glfwWindowHint(GLFW_SRGB_CAPABLE, GLFW_TRUE);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-#ifdef __APPLE_
+#ifdef __APPLE__
   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
   glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
   const char *glslVersion = "#version 150";

modules/mpi/tutorials/GLFWDistribOSPRayWindow.cpp

@@ -55,7 +55,7 @@ GLFWDistribOSPRayWindow::GLFWDistribOSPRayWindow(const vec2i &windowSize,
 
     glfwWindowHint(GLFW_SRGB_CAPABLE, GLFW_TRUE);
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
-#ifdef __APPLE_
+#ifdef __APPLE__
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
     glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
     const char *glslVersion = "#version 150";