Make G2G as default during the compilation... #1820

Job	Run time
build-on-cuda (OPENMP=ON)	9m 27s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, openmpi)	4m 11s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, mpich)	4m 5s
build-on-opencl (OPENMP=ON, SMM=libxsmm)	10m 30s
build-on-rocm (OPENMP=ON, G2G=ON)	3m 22s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, openmpi)	4m 3s
build-on-rocm (OPENMP=ON, G2G=OFF)	3m 36s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, mpich)	3m 53s
pre-commit	1m 9s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, openmpi)	4m 4s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, mpich)	3m 39s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, openmpi)	3m 47s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, mpich)	3m 29s
build-and-test (MPI=OFF, OPENMP=ON, SMM=blas, openmpi)	5m 33s
build-and-test (MPI=OFF, OPENMP=ON, SMM=libxsmm, openmpi)	5m 16s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=blas, openmpi)	3m 36s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=libxsmm, openmpi)	3m 20s
Combine & check coverage.	32s
	1h 17m 32s

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