[Bug 208622] devel/obby: Fix build with libc++ 3.8.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208622

            Bug ID: 208622
           Summary: devel/obby: Fix build with libc++ 3.8.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: dim at FreeBSD.org

Created attachment 169094
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169094&action=edit
Fix type for abs() calls in devel/obby

During the exp-run in bug 208158, it was found that devel/obby gives errors
with libc++ 3.8.0 [1]:

colour.cpp:50:9: error: call to 'abs' is ambiguous
        return abs(m_red - colour.m_red) +
               ^~~

This is because abs() is being called with unsigned arguments.  Fix this by
casting the arguments to the appropriate signed type.

[1]
http://package18.nyi.freebsd.org/data/headamd64PR208158-default/2016-03-22_18h30m05s/logs/errors/obby-0.4.8_2.log

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