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

include/wx/features.h

@@ -103,24 +103,12 @@
     #define wxHAVE_RAW_BITMAP
 #endif
 
-/*
-   If this is defined, wxEvtHandler::Bind<>() is available (not all compilers
-   have the required template support for this and in particular under Windows
-   where only g++ and MSVC >= 7 currently support it.
-
-   Recent Sun CC versions support this but perhaps older ones can compile this
-   code too, adjust the version check if this is the case (unfortunately we
-   can't easily test for the things used in wx/event.h in configure so we have
-   to maintain these checks manually). The same applies to xlC 7: perhaps
-   earlier versions can compile this code too but they were not tested.
- */
-#if wxCHECK_GCC_VERSION(3, 2) || wxCHECK_VISUALC_VERSION(7) \
-        || (defined(__SUNCC__) && __SUNCC__ >= 0x5100) \
-        || (defined(__xlC__) && __xlC__ >= 0x700) \
-        || defined(__INTELC__) || defined( __VMS )
-    #define wxHAS_EVENT_BIND
-#endif
 
+// Previously this symbol wasn't defined for all compilers as Bind() couldn't
+// be implemented for some of them (notably MSVC 6), but this is not the case
+// any more and Bind() is always implemented when using any currently supported
+// compiler, so this symbol exists purely for compatibility.
+#define wxHAS_EVENT_BIND
 
 #endif /*  _WX_FEATURES_H_ */