Put quotes around entire static link variables

CMake is very aggressive about minimising the list of libraries,
so we need to be similarily aggressive about quotes to make sure
we get everything we want and in the correct order.
Only link with crypt32 on Windows

crypt32 is a Windows thing, and it is used no matter the crypto
backend.
Include gettext and zlib in static GnuTLS link

This is needed to make sure they are always included, and in the
proper order.
Remove verbose TLS logging

We don't even log this much for RFB protocol stuff, and it makes
it very annoying to run with full debugging on.
Remove unused variable
Use dynamic builds by default

Static builds are the special case, so it should be left off
by default.
Merge branch 'build' of https://github.com/CendioOssman/tigervnc