Remove MSVC6 support.

Don't support this compiler any more, this allows to get rid of tons of
MSVC6-specific workarounds, in particular we can now use Bind() and natural
template functions calls in the library code.

Also remove MSVC6 project and solution files and don't generate them when
bakefile_gen is ran any more (removing the remaining occurrences of msvc6prj
from the bakefiles results in weird bake-time errors, so it's simpler to just
leave them there).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76532 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/mediactrl_am.cpp

@@ -49,12 +49,6 @@
     #pragma hdrstop
 #endif
 
-// disable "cast truncates constant value" for VARIANT_BOOL values
-// passed as parameters in VC6
-#ifdef _MSC_VER
-#pragma warning (disable:4310)
-#endif
-
 #if wxUSE_MEDIACTRL && wxUSE_ACTIVEX
 
 #include "wx/mediactrl.h"
@@ -92,11 +86,10 @@
 //  ($Microsoft Visual Studio$/Common/Tools/OLEVIEW.EXE), open
 //  "type libraries", open a specific type library (for quartz for example its
 //  "ActiveMovie control type library (V1.0)"), save it as an .idl, compile the
-//  idl using the midl compiler that comes with visual studio
-//  ($Microsoft Visual Studio$/VC98/bin/midl.exe on VC6) with the /h argument
-//  to make it generate stubs (a .h & .c file), then clean up the generated
-//  interfaces I want with the STDMETHOD wrappers and then put them into
-//  mediactrl.cpp.
+//  idl using the midl compiler that comes with visual studio with the /h
+//  argument to make it generate stubs (a .h & .c file), then clean up the
+//  generated interfaces I want with the STDMETHOD wrappers and then put them
+//  into mediactrl.cpp.
 //
 //  According to the MSDN docs, IMediaPlayer requires Windows 98 SE
 //  or greater.  NetShow is available on Windows 3.1 and I'm guessing