FreeBSD/ports 9551168 (r502188)lang/gcc9-devel distinfo Makefile

Update to the 20180518 snapshot of GCC 9.1.1.

Proactively add a CONFLICTS statement with the lang/gcc9 port that
should be landing any day now.  That'll avoid a PORTREVISION bump
and rebuild at that point.
DeltaFile
+3-3lang/gcc9-devel/distinfo
+3-1lang/gcc9-devel/Makefile
+6-42 files

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