Remove checks for ancient gcc/MinGW versions.

Don't test for wxUSE_NORLANDER_HEADERS, this is always true since many, many
years.

Remove tests for gcc version < 3.3, notably 2.95: the minimal supported gcc
version is 3.4.

Closes #15727.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76549 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/window.cpp

@@ -106,7 +106,7 @@
 
 #include <string.h>
 
-#if (!defined(__GNUWIN32_OLD__) && !defined(__WXMICROWIN__) /* && !defined(__WXWINCE__) */ ) || defined(__CYGWIN10__)
+#if !defined(__WXMICROWIN__)
     #include <shellapi.h>
     #include <mmsystem.h>
 #endif