Move generic VOL wrapper creation into helper #112

Job	Run time
build-and-test (autotools, true, multithread, production)	2h 4m 32s
build-and-test (autotools, true, multithread, debug)	2h 4m 33s
build-and-test (autotools, true, threadsafe, production)	14m 35s
build-and-test (autotools, true, threadsafe, debug)	16m 42s
build-and-test (autotools, true, singlethread, production)	12m 36s
build-and-test (autotools, true, singlethread, debug)	14m 10s
build-and-test (autotools, false, multithread, production)	2h 4m 36s
build-and-test (autotools, false, multithread, debug)	2h 4m 33s
build-and-test (autotools, false, threadsafe, production)	13m 43s
build-and-test (autotools, false, threadsafe, debug)	15m 54s
build-and-test (autotools, false, singlethread, production)	11m 52s
build-and-test (autotools, false, singlethread, debug)	13m 48s
build-and-test (cmake, true, multithread, production)	23m 52s
build-and-test (cmake, true, multithread, debug)	27m 22s
build-and-test (cmake, true, threadsafe, production)	11m 54s
build-and-test (cmake, true, threadsafe, debug)	11m 45s
build-and-test (cmake, true, singlethread, production)	10m 3s
build-and-test (cmake, true, singlethread, debug)	9m 47s
build-and-test (cmake, false, multithread, production)	23m 44s
build-and-test (cmake, false, multithread, debug)	25m 4s
build-and-test (cmake, false, threadsafe, production)	13m 19s
build-and-test (cmake, false, threadsafe, debug)	11m 36s
build-and-test (cmake, false, singlethread, production)	9m 56s
build-and-test (cmake, false, singlethread, debug)	9m 38s
	13h 19m 34s

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