Issue compiling in Ruby 2.0

Apparently, for some reason, if we don't check for the frameworks, they don't get integrated into the bundle.

This might also have to do with the fact that Mavericks changed the location OpenGL headers.

#### 1.9.3-p448

```
checking for glVertex3d() in -lopengl32.lib... no
checking for main() in -lopengl32... no
checking for glVertex3d() in -lGL... no
checking for OpenGL... yes
checking for GLUT... yes
checking for Cocoa... yes
checking for GL/gl.h... yes
checking for GL/glu.h... yes
checking for GL/glut.h... yes
checking for GL/glx.h... yes
checking for dlfcn.h... yes
checking for windows.h... no
checking for stdint.h... yes
checking for inttypes.h... yes
checking for wglGetProcAddress() in wingdi.h... no
checking for struct RFloat.float_value... yes
checking for int64_t in stdint.h... yes
checking for uint64_t in stdint.h... yes
```

#### 2.0.0-p353

```
checking for glVertex3d() in -lopengl32.lib... no
checking for main() in -lopengl32... no
checking for glVertex3d() in -lGL... yes
checking for gluLookAt() in -lGLU... yes
checking for glutSolidTeapot() in -lglut... yes
checking for GL/gl.h... yes
checking for GL/glu.h... yes
checking for GL/glut.h... yes
checking for GL/glx.h... yes
checking for dlfcn.h... yes
checking for windows.h... no
checking for stdint.h... yes
checking for inttypes.h... yes
checking for wglGetProcAddress() in wingdi.h... no
checking for struct RFloat.float_value... yes
checking for int64_t in stdint.h... yes
checking for uint64_t in stdint.h... yes
```

When using ashton gem I would get.

```
ashton/lib/ashton/mixins/version_checking.rb:9:in `check_opengl_version': OpenGL 2.0 required to utilise Ashton::Shader (Ashton::NotSupportedError)
```

As soon as the frameworks got compiled error went away.