Use H5_ATOMIC macros in H5VL #249

Job	Run time
Windows MSVC CMake REL TS	3m 10s
Windows MSVC CMake DBG TS	3m 8s
Windows MSVC CMake REL	3m 17s
Windows MSVC CMake DBG	3m 15s
Ubuntu gcc CMake REL TS	1s
Ubuntu gcc CMake DBG TS	1s
Ubuntu gcc CMake REL	1s
Ubuntu gcc CMake DBG	1s
Ubuntu gcc Autotools REL TS	1s
Ubuntu gcc Autotools DBG TS	1s
Ubuntu gcc Autotools REL	1s
Ubuntu gcc Autotools DBG	1s
Ubuntu gcc Autotools parallel (build only) REL TS	1s
Ubuntu gcc Autotools parallel (build only) DBG TS	1s
Ubuntu gcc Autotools parallel (build only) REL	1s
Ubuntu gcc Autotools parallel (build only) DBG	1s
MacOS Clang CMake REL TS	1m 59s
MacOS Clang CMake DBG TS	2m 47s
MacOS Clang CMake REL	6m 47s
MacOS Clang CMake DBG	3m 44s
Ubuntu gcc Autotools v1.6 default API (build only) DBG	1s
Ubuntu gcc Autotools v1.8 default API (build only) DBG	1s
Ubuntu gcc Autotools v1.10 default API (build only) DBG	1s
Ubuntu gcc Autotools v1.12 default API (build only) DBG	1s
Ubuntu gcc Autotools no deprecated symbols (build only) DBG	1s
Ubuntu gcc Autotools -Werror (build only) DBG	1s
Ubuntu gcc Autotools -Werror (build only) REL	1s
Ubuntu gcc Autotools parallel -Werror (build only) DBG	1s
Ubuntu gcc Autotools parallel -Werror (build only) REL	1s
	28m 28s

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