port rev-upgrade appearing on gcc9

[Jack Howarth]

    Despite the fact that the git sources for gcc9 show a revision change
to 2 in order to rebuild against the newer isl package, the current package
built for darwin18 doesn't seem to be built that way. I get...

% sudo  port install gcc9

--->  Computing dependencies for gcc9

--->  Fetching archive for gcc9

--->  Attempting to fetch gcc9-9.2.0_2.darwin_19.x86_64.tbz2 from
https://packages.macports.org/gcc9

--->  Attempting to fetch gcc9-9.2.0_2.darwin_19.x86_64.tbz2.rmd160 from
https://packages.macports.org/gcc9

--->  Installing gcc9 @9.2.0_2

--->  Activating gcc9 @9.2.0_2

--->  Cleaning gcc9

--->  Scanning binaries for linking errors

--->  Found 6 broken files, matching files to ports

--->  Found 1 broken port, determining rebuild order

You can always run 'port rev-upgrade' again to fix errors.

The following ports will be rebuilt: gcc9 @9.2.0

Continue? [Y/n]:
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