explorer: redeclaration of _pctype from const to static

target file:
base/shell/explorer/utility/utility.h

like the reported in [3598], precompiling header for explorer may fail under certain build environments (and in this case, specifically under non-win32 hosts), overriding the declaration of _pctype.
Below, the patch to fix this issue.

Marcelo A. B. Slomp

Index: base/shell/explorer/utility/utility.h
===================================================================
— base/shell/explorer/utility/utility.h (revision 34860)
+++ base/shell/explorer/utility/utility.h (working copy)
@@ -25,6 +25,11 @@
// Martin Fuchs, 23.07.2003
//

+ // standard windows headers
+#define WIN32_LEAN_AND_MEAN
+#define WIN32_EXTRA_LEAN
+#include <windows.h>
+
#ifdef __cplusplus

#ifdef _MSC_VER
@@ -39,11 +44,6 @@
#endif /* __cplusplus */

• // standard windows headers
  -#define WIN32_LEAN_AND_MEAN
  -#define WIN32_EXTRA_LEAN
  -#include <windows.h>
  -
  // Unicode support
  #if defined(UNICODE) && !defined(_UNICODE)
  #define _UNICODE