glsl/glcpp: Combine the two rules matching any character

glsl/glcpp: Combine the two rules matching any character

Using a single rule here means that we can use the <*> syntax to match
all start conditions. This makes the catch-all rule more robust against
the addition of future start conditions, (no need to maintain an ever-
growing list of start conditions for this rul).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>