Add support for OpenGL in bitmaps using libOSMesa

Packages describing “osmesa” as local USE flag

Package “osmesa” Flag Description
app-emulation/crossover-bin Add support for OpenGL in bitmaps using libOSMesa
app-emulation/aranym Allow images to be rendered in memory using the host CPU
app-emulation/wine-vanilla Enable off-screen rendering (OpenGL in bitmaps) support
app-emulation/wine-proton Enable off-screen rendering (OpenGL in bitmaps) support
app-emulation/wine-staging Enable off-screen rendering (OpenGL in bitmaps) support
media-libs/mesa Build the Mesa library for off-screen rendering.

All packages providing a “osmesa” USE flag (6)