fixed linker error #58

Job	Run time
CppUnix (Release, ubuntu-latest)	6m 41s
CppUnix (Release, macos-11.0)	7m 47s
CppUnix (Debug, ubuntu-latest)	5m 32s
CppUnix (Debug, macos-11.0)	37m 34s
CppWindows (static, Release, Win32)	6m 17s
CppWindows (static, Release, x64)	4m 30s
CppWindows (static, Debug, Win32)	4m 37s
CppWindows (static, Debug, x64)	4m 19s
CppWindows (dynamic, Release, Win32)	5m 20s
CppWindows (dynamic, Release, x64)	4m 36s
CppWindows (dynamic, Debug, Win32)	3m 48s
CppWindows (dynamic, Debug, x64)	4m 17s
	1h 35m 18s

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