glfw2.7.2 converted to glfw2.d

I am not sure if this is desirable given that glfw3 is newer; in any case I thought I would contribute this since I still use glfw2.7.

#### Relevant files
* /deimos/glfw/glfw2.d
* /c/glfw2.h

##### Differences between 2.7.2 and 2.7.7 headers (which didn't seem important)
```
163,168c163
<  #if defined(GLFW_INCLUDE_GL3)
<   #include <OpenGL/gl3.h>
<  #else
<   #define GL_GLEXT_LEGACY
<   #include <OpenGL/gl.h>
<  #endif
---
>  #include <OpenGL/gl.h>
173,177c168
<  #if defined(GLFW_INCLUDE_GL3)
<   #include <GL3/gl3.h>
<  #else
<   #include <GL/gl.h>
<  #endif
---
>  #include <GL/gl.h>
190c181
```