build_interface for fortran #1270

Job	Run time
ci (Release, linux gnu-10)	1m 56s
ci (Release, linux gnu-12)	1m 5s
ci (Release, linux gnu-7)	1m 28s
ci (Release, linux clang-12)	1m 30s
ci (Release, linux intel)	4m 7s
ci (Release, linux intel-classic)	3m 51s
ci (Release, macos)	2m 12s
ci (Debug, linux gnu-10)	1m 42s
ci (Debug, linux gnu-12)	1m 10s
ci (Debug, linux gnu-7)	2m 7s
ci (Debug, linux clang-12)	1m 42s
ci (Debug, linux intel)	3m 38s
ci (Debug, linux intel-classic)	3m 36s
ci (Debug, macos)	2m 2s
	32m 6s

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