Log Message:
This is for pkg/42778.  I sent fix to submitter on Feb. 9 but
realized didn't make it to the ticket. Yesterday, I happened to
have same problem (on two systems).

I see from the cvs log message for xf86vidmodeproto that some headers
got moved to libXxf86vm. And I see libXxf86vm now has needed
header. But the buildlink3.mk didn't get changed so the older version of
libXxf86vm is good enough.

So increased the BUILDLINK_API_DEPENDS.libXxf86vm to libXxf86vm>=1.1.0