Prevent installation of ixwebsocket and keychain files #1359

Job	Run time
macos-Debug	4m 8s
macos-RelWithDebInfo	3m 53s
msys2-mingw64 (Debug, false)	7m 12s
msys2-mingw64 (RelWithDebInfo, false)	7m 43s
msys2-mingw64 (MinSizeRel, false)	4m 52s
msys2-mingw64 (RelWithDebInfo, true)	6m 49s
linux-MinSizeRel	10m 56s
linux-RelWithDebInfo	13m 54s
linux-Debug	11m 24s
	1h 10m 51s

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