Remove unnecessary setting of CXX for fortran. #110

Job	Run time
Autotools Debug Workflows / GCC-debug-TS=disabled	12m 56s
Autotools Special Workflows / gcc no deprecated symbols (build only)	5m 15s
Autotools Parallel Workflows / Parallel GCC-debug	5m 20s
Autotools Special Workflows / gcc DBG -Werror (build only)	4m 44s
Autotools Special Workflows / gcc REL -Werror (build only)	5m 25s
Autotools Special Workflows / gcc DBG v1.10 default API (build only)	5m 23s
Autotools Special Workflows / gcc DBG v1.12 default API (build only)	5m 6s
Autotools Special Workflows / gcc DBG v1.14 default API (build only)	5m 24s
Autotools Special Workflows / gcc DBG v1.6 default API (build only)	5m 14s
Autotools Special Workflows / gcc DBG v1.8 default API (build only)	5m 24s
Autotools Debug Thread-Safety Workflows / GCC-debug-TS=enabled	4m 57s
Autotools Parallel Special Workflows / gcc DBG parallel -Werror (build only)	4m 48s
Autotools aocc Workflows / aocc production	16m 50s
Autotools Parallel Special Workflows / gcc REL parallel -Werror (build only)	5m 44s
Autotools Intel Workflows / linux-oneapi production	13m 0s
Autotools nvhpc Workflows / nvhpc production	16m 52s
Autotools Release Workflows / GCC-production-TS=disabled	12m 36s
Autotools TestExpress Workflows / Autotools production Express Test Workflows	15m 14s
Autotools Parallel Workflows / Parallel GCC-production	6m 18s
Autotools TestExpress Workflows / Autotools debug Express Test Workflows	14m 30s
Autotools Release Thread-Safety Workflows / GCC-production-TS=enabled	6m 18s
	2h 57m 18s

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