fix: add HAVE_GFORTRAN #2616

Job	Run time
Build source R package	4m 52s
Coverage	4m 55s
Check windows-latest (release)	15m 47s
Sanitizer	24m 47s
Check macOS-latest (release)	12m 47s
Check ubuntu-20.04 (release)	6m 32s
Check ubuntu-20.04 (devel)	6m 15s
Check ubuntu-20.04 (oldrel-1)	6m 18s
Check ubuntu-20.04 (oldrel-2)	6m 33s
Check ubuntu-20.04 (oldrel-3)	5m 51s
Check ubuntu-20.04 (oldrel-4)	5m 29s
	1h 40m 6s

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