Moved the majority of GLX code into opengl module.

src/x11_platform.h

@@ -113,7 +113,6 @@ typedef intptr_t GLFWintptr;
 //------------------------------------------------------------------------
 typedef struct _GLFWcontextGLX
 {
-    GLXFBConfigID fbconfigID;        // ID of selected GLXFBConfig
     GLXContext    context;           // OpenGL rendering context
     XVisualInfo*  visual;            // Visual for selected GLXFBConfig
 
@@ -283,6 +282,12 @@ GLFWGLOBAL struct {
 // Time
 void _glfwInitTimer(void);
 
+// OpenGL support
+int _glfwCreateContext(_GLFWwindow* window,
+                       const _GLFWwndconfig* wndconfig,
+                       const _GLFWfbconfig* fbconfig);
+void _glfwDestroyContext(_GLFWwindow* window);
+
 // Fullscreen support
 int  _glfwGetClosestVideoMode(int* width, int* height, int* rate);
 void _glfwSetVideoModeMODE(int mode, int rate);