Enable building dev-lang/go code/examples

Packages describing “go” as local USE flag

Package “go” Flag Description
media-libs/libheif Enable building dev-lang/go code/examples
www-servers/uwsgi Build the gccgo plugin to run Go applications.
dev-lang/gnat-gpl Build the GCC Go language frontend.
x11-wm/fvwm3 Enable building dev-lang/go code (FvwmPrompt)
sys-devel/gcc Build the GCC Go language frontend.

All packages providing a “go” USE flag (5)