Fixes for namespaced enum changes made in glfw-rs

...as seen in bjz/glfw-rs@d74ceed99cd12c65c0b8c9c234f9eb2cf2045001
Merge pull request #442 from mttr/master

Fixes for namespaced enum changes made in glfw-rs
Resolved namespaced enum errors
Resolved MapAccess namespaced enum errors
Merge pull request #443 from mitchmindtree/master

Resolved namespaced enum errors in gfx_macros