Few Visual Studio build fixes
Hi,
Here are some build fixes for glib-networking for Visual Studio builds for the following:
-Make sure that we don't bail out when we can't find the pkg-config files for OpenSSL. Instead, when they are not found, look for the headers and the correct .lib pair.
-Make the GNOME proxy module work on Visual Studio builds, by exporting the *_load(), *_unload() and *_query() symbols, since gsettings-desktop-schemas is installable and usable on Windows for some time. Note that the tests do pass on Visual Studio builds for this.
With blessings, thank you!