D3D11: Enable texture format enumeration on Linux.
D3D11: Enable texture format enumeration on Linux.

LWJGL-CI/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx