Nothing Unix-specific about <stdlib.h>

Although unsure whether this source file actually uses anything declared in
<stdlib.h>...

Change-Id: Ibb5dfe5d0de1576a37a5f2c9cffcd9b850602b14

basic/source/sbx/sbxscan.cxx

@@ -23,9 +23,7 @@
 
 #include "unotools/syslocale.hxx"
 
-#if defined ( UNX )
 #include <stdlib.h>
-#endif
 
 #include <vcl/svapp.hxx>
 #include <math.h>