FreeBSD/ports c232d83 (r484990)science/gromacs distinfo Makefile

science/gromacs: Update 2018.3 -> 2018.4

Reported by:    portscout
DeltaFile
+3-3science/gromacs/distinfo
+2-3science/gromacs/Makefile
+1-1science/gromacs/pkg-plist
+6-73 files

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