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

tests/weakref/weakref.cpp

@@ -90,12 +90,8 @@ void WeakRefTestCase::DeclareTest()
 {
     {
         // Not initializing or initializing with NULL should work too
-        //
-        // FIXME-VC6: but it doesn't with VC6, see comment in wx/weakref.h
-#ifndef __VISUALC6__
         wxWeakRef<wxEvtHandler> wroDef;
         wxWeakRef<wxEvtHandler> wro0(NULL);
-#endif // __VISUALC6__
 
         wxObject o; // Should not work
         wxEvtHandler eh;
@@ -169,9 +165,6 @@ void WeakRefTestCase::AssignTest()
     CPPUNIT_ASSERT( !wro2 );
 
     // Explicitly resetting should work too
-    //
-    // FIXME-VC6: as above, it doesn't work with VC6, see wx/weakref.h
-#ifndef __VISUALC6__
     wxEvtHandler eh;
     wxObjectTrackable ot;
 
@@ -183,7 +176,6 @@ void WeakRefTestCase::AssignTest()
 
     CPPUNIT_ASSERT( !wro1 );
     CPPUNIT_ASSERT( !wro2 );
-#endif // __VISUALC6__
 }
 
 void WeakRefTestCase::AssignWeakRefTest()