Update bgfx_shader.sh (#1819)
Update bgfx_shader.sh (#1819)

New matrix function operations.
LWJGL-CI/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,jdryg/bgfx,bkaradzic/bgfx,jdryg/bgfx,fluffyfreak/bgfx,fluffyfreak/bgfx,LWJGL-CI/bgfx,mendsley/bgfx,fluffyfreak/bgfx,jpcy/bgfx,jdryg/bgfx,fluffyfreak/bgfx,jpcy/bgfx,LWJGL-CI/bgfx,jdryg/bgfx,bkaradzic/bgfx,mendsley/bgfx,emoon/bgfx,emoon/bgfx,jpcy/bgfx,jpcy/bgfx,LWJGL-CI/bgfx,mendsley/bgfx,emoon/bgfx