Improve MinGW support.

- Code specific to Windows was #ifdef'ed with _MSC_VER so it wasn't included with MinGW. So _MSC_VER is replaced with _WIN32.
- MinGW doesn't support _get_pgmptr() so it is necessary to directly call the Win32 function GetModuleFileName(). This implies including windows.h which in turn causes a name clash with the Win32 function SearchPath(). So the cc65 type SearchPath is renamed to SearchPaths.

src/common/filetime.h

@@ -2,7 +2,7 @@
 /*                                                                           */
 /*                                filetime.h                                 */
 /*                                                                           */
-/*                   Replacement for buggy Microsoft code                    */
+/*                       Replacement for Windows code                        */
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */