Log Message:
xorgproto: Force consistent man page installation for SunOS/etc

It appears to attempt to detect whether the system uses "Sys-V"-style
man categories by checking for a specific file in /usr/share/man.

This doesn't seem to be particularly accurate and causes problems with
varying PLISTs on pkgsrc depending on the system's filesystem layout.

So just force a consistent category number for "misc" pages for every OS,
for now...