fix: use prepare cleanup hooks when epics-base>=7.0.8.0 (#67) #858

Job	Run time
Linux CentOS 7	3m 39s
Linux fedora latest	4m 5s
Native Linux (WError)	5m 52s
Native Linux (libc++ debug)	5m 42s
Native Linux (c++17)	5m 3s
Cross mingw64 DLL	10m 59s
Cross mingw64 static	11m 28s
RTEMS5	14m 27s
Native Linux with clang	4m 50s
Native Linux with clang ubsan	4m 53s
Native Linux with libevent stable	5m 27s
Native Linux with 7.0.2	4m 4s
Native Linux with 3.15	3m 49s
Native Linux with 3.14	6m 3s
OSX	3m 26s
vs2019 DLL	9m 1s
vs2019 static	8m 31s
	1h 51m 19s

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