Disables mlogc compilation with Curl was not found

This commit automatic disables Curl compilation if Curl development files were
not found on build machine.
IIS: Changes Curl version and removes OpenSSL dependency

As the this new Curl version supports well the Windows certificate storage,
removing the dependency on the OpenSSL. Also changing the build scripts to work
accordingly. As the cmake build of Curl is said to broken abandoning it in
favor of the nmake files. Thanks to Gregg Smith and Steffen.
IIS: Creates IIS_VERSION definition

This definition is currently used in two different circumstances: Report with
accuracy that the server is an IIS  (status call), and also show the amount of
loaded remote rules on the windows logs. Different from Apache which loads the
rules twice, IIS just do it once.