Document the convention to use variables prefixed by VIRTUAL_RUNTIME.
Add references to the new term where possible.
Another reason is that such variables are recommended
in a warning issued by meta/classes-global/insane.bbclass
(From yocto-docs rev: 692ee19c99d015adf79da540b03d12245f7024f4)
Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reported-by: Tim Orling <ticotimo@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>