gl function fails to load for demo

[wyhinton]

Cloning the repo and running the demo app with cargo run --release I get error:

thread 'main' panicked at 'gl function was not loaded', C:\Users\Primary User\Desktop\texture synthesis app\MY_Examples\FLTK-RS-Examples\froggy\froggy\target\release\build\gfx_gl-51c8fbfcfdb49c23\out/gl_bindings.rs:1506:13

Rustc: 1.52.1
OS: Windows 10

Possibly related to gfx-rs/gfx#1298?