Add support for setting a profile photo in media-video/cheese

Packages describing “webcam” as local USE flag

Package “webcam” Flag Description
x11-misc/mugshot Add support for setting a profile photo in media-video/cheese
x11-wm/xpra Enable webcam support via opencv
games-arcade/performous Enable Webcam support
media-gfx/fotowall Enable webcam support

All packages providing a “webcam” USE flag (4)