[CMake] Pseudo library

[☂Josh Chia (谢任中)]

I have a C++ .h file with template classes that require the Python and
Boost-Python libraries for successful linking. There is no associated .cpp
file.

I consider this .h file a library that other parts of my project can use.
The CMakefile.txt for those parts should not need to know the implementation
detail that the Python and Boost-Python libraries are needed. Is there a way
to create a pseudo-library, say, 'foo', that those other parts can link,
e.g. with target_link_libraries, so that they just need to link the pseudo
library 'foo' in order to effectively depend on and link to the Python and
Boost-Python libraries?

Note that my pseudo-library is pseudo because it doesn't have any .cpp file.
I can't actually compile that into a real library, and add_library won't
allow me to specify zero source  files.
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