[Bug 241611] [exp-run] with additional __isnan macros in math.h

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241611

            Bug ID: 241611
           Summary: [exp-run] with additional __isnan macros in math.h
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: dim at FreeBSD.org
                CC: ports-bugs at FreeBSD.org

Created attachment 208724
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=208724&action=edit
Add __isnan and __isnanf to math.h

In bug 241550, Gleb Popov reports that trivia CUDA programs can't be compiled
due to missing __isnan and __isnanf functions.  These are apparently Linuxisms.

I have prepared a patch which adds these as macro aliases to <math.h>, but
since these isnan functions and macros have a long history of compatibility
problems, I would prefer to see an exp-run done before I commit it.

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