Merge pull request #219 from dariomanesku/master

Small imgui update.
Updated edtaa3 source code.
Merge branch 'master' of github.com:bkaradzic/bgfx
Android: Fixed GLES3+ build.
Fixed compile and linking under mingw environment
Merge pull request #221 from mmicko/master

Fixed compile and linking under mingw environment
X11: Relax polling input.
Fixed shared lib build.
Android: Added input handling.
Predefined uniforms refactoring.
Fixed example 24-nbody with OVR.
Added compute dispatch flags.
Fixed build.
Added 1px offset to imguiBorderButton() to fix DX9 drawing problem.
Changed imguiTabs() active color to be consistent with imguiButton().