don't use annoying and unneeded in C++ casts of NULL to "T *" in all other files neither

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58227 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/utilscmn.cpp

@@ -182,7 +182,7 @@ wxString wxNow()
     return wxEmptyString;
 #endif
 #else
-    time_t now = time((time_t *) NULL);
+    time_t now = time(NULL);
     char *date = ctime(&now);
     date[24] = '\0';
     return wxString::FromAscii(date);