cmake: Add missing feature macros in config header

The curl_config.h file can be generated either from curl_config.h.cmake
or curl_config.h.in, depending on whether you're building using CMake or
the autotools.  The CMake template header doesn't include entries for
all of the protocols that you can disable, which (I think) means that
you can't actually disable those protocols when building via CMake.

Closes #523