giscanner/ccompiler.py: Initiate Distutils Compiler Instance
This updates the __init__ constructor method of CCompiler so that distutils can be used, with some environment or user-supplied options to create the compiler instance that is appropriate with the platform that the giscanner scripts are being run on, and sets some specific environment for the compilers as necessary. This also adds a check_is_msvc() method that will progressively replace calls in the other giscanner scripts that attempt to check for CC=cl (or so), where a part of which is done in this patch. This is done for dumper.py as well as it needs to be updated in this patch to use the updated ccompiler.py which uses distutils to initiate the compiler instance. Also, as we have been using the --library option on Windows to pass in the library (not DLL) to deduce the correct DLL to link to in the introspection files for some time, we no longer need to make a copy of the library (.lib) to introspect that matches the <namespace>-<namespace_version>.lib convention, but use the libraries that were passed in with --library directly, so that we can link the dumper program during the introspection build. Please note that this also partially reverts commit c9cfa2b5 as the distutils items are clearly needed for these to work. https://bugzilla.gnome.org/show_bug.cgi?id=728313
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