FreeBSD/ports fc20284 (r506787)lang/gcc8-devel distinfo Makefile

Update to the 20180712 snapshot of GCC 8.3.1.

This brings bugfixes in the Fortran frontend and optimization.
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+3-3lang/gcc8-devel/distinfo
+1-1lang/gcc8-devel/Makefile
+4-42 files

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