build

Move GPU initialisation to WAM_INIT_GPU_MOD #209

Job	Run time
ci (Release, linux gnu-10)	6m 49s
ci (Release, linux gnu-10)	6m 49s
ci (Release, linux clang-12)	7m 6s
ci (Release, linux clang-12)	7m 6s
ci (Release, linux intel-classic)	8m 47s
ci (Release, linux intel-classic)	8m 47s
ci (Release, macos)	1m 47s
ci (Release, macos)	32m 35s
ci (linux nvhpc-21.9, ubuntu-20.04, nvhpc-21.9, nvc, nvc++, nvfortran, -DCMAKE_CXX_FLAGS=--diag_s...	9m 59s
ci (linux nvhpc-21.9, ubuntu-20.04, nvhpc-21.9, nvc, nvc++, nvfortran, -DCMAKE_CXX_FLAGS=--diag_s...	9m 59s
	1h 39m 44s

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