[Bug 241194] math/gfan: fix build on 13.0-CURRENT

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241194

            Bug ID: 241194
           Summary: math/gfan: fix build on 13.0-CURRENT
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-qa
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: phascolarctos at protonmail.ch
 Attachment #208243 maintainer-approval+
             Flags:

Created attachment 208243
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=208243&action=edit
gfan - fix on 13.0-CURRENT

At the moment gfan is broken on 13.0-CURRENT. Apparently this is due to a
conflict between the definition of log2 in math.h and the definition of log2 in
gfan's sources: the patch I propose should fix this issue.


See the following links for the actual errors:

http://beefy17.nyi.freebsd.org/data/head-i386-default/p514206_s353378/logs/gfan-0.6.2_1.log
http://beefy18.nyi.freebsd.org/data/head-amd64-default/p514206_s353378/logs/gfan-0.6.2_1.log

-------------------

I tested successfully the patch with poudriere on {11.3,12.0}-RELEASE
{i386,amd64}. Of course it needs to be tested on 13.0-CURRENT, but
unfortunately I am unable to do so: I run 12.1-STABLE and cannot run
13.0-CURRENT jails, while virtualization is quite difficult for my old and slow
hardware. Then I ask if someone else can please test it.

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