Multiple definitions for D
The following variables will be defined two times in enums.d:
```bash
glad/gl/enums.d(21,11): Error: variable `glad.gl.enums.GL_FALSE` conflicts with variable `glad.gl.enums.GL_FALSE` at glad/gl/enums.d(5,12)
glad/gl/enums.d(22,11): Error: variable `glad.gl.enums.GL_TRUE` conflicts with variable `glad.gl.enums.GL_TRUE` at glad/gl/enums.d(6,12)
glad/gl/enums.d(39,11): Error: variable `glad.gl.enums.GL_ZERO` conflicts with variable `glad.gl.enums.GL_ZERO` at glad/gl/enums.d(9,11)
glad/gl/enums.d(40,11): Error: variable `glad.gl.enums.GL_ONE` conflicts with variable `glad.gl.enums.GL_ONE` at glad/gl/enums.d(10,11)
glad/gl/enums.d(50,11): Error: variable `glad.gl.enums.GL_NONE` conflicts with variable `glad.gl.enums.GL_NONE` at glad/gl/enums.d(8,11)
glad/gl/enums.d(60,11): Error: variable `glad.gl.enums.GL_NO_ERROR` conflicts with variable `glad.gl.enums.GL_NO_ERROR` at glad/gl/enums.d(7,11)
glad/gl/enums.d(1187,11): Error: variable `glad.gl.enums.GL_INVALID_INDEX` conflicts with variable `glad.gl.enums.GL_INVALID_INDEX` at glad/gl/enums.d(12,11)
glad/gl/enums.d(1229,11): Error: variable `glad.gl.enums.GL_TIMEOUT_IGNORED` conflicts with variable `glad.gl.enums.GL_TIMEOUT_IGNORED` at glad/gl/enums.d(13,12)
```
I've had this happen with multiple versions.