With the new compiled Boost on the Windows machine, there is no need to add
zlib, bzip2, lzma, and zstd as extra dependencies. The compiled Boost binaries
include `libboost_zlib` and `libboost_bzip2` (lzma and zstd are not required).

Related to issue #133

Necessary especially for multi-configuration generators

split boost libs / additional libs: Necessary for multi-config generators (continued in next commits)

to avoid ambiguities while allowing for concise file names

and omit 'BORNAGAIN_' so that I can use certain shell aliases across
projects.

Treat it as any other 3rd-party dependence

this requires some ad-hoc code to work with both the C and the CPP
version of libcerf.