or later. This updates the include/license.h file, which is used for the
/LICENSE command, to say "GPLv2 or later".
The 'LICENSE' file shipped with UnrealIRCd since at least the year 2000
has always been the GPLv2.
In the copyright headers of individual .c and .h files we have a mix of
"GPLv1 or later" and "GPLv2 or later", so "GPLv2 or later" is the common
denominator.