backwards memcpy

--- src/slgetkey.c.orig	Fri Jan 30 12:01:25 2015
+++ src/slgetkey.c	Fri Jan 30 12:03:19 2015
@@ -45,7 +45,7 @@ unsigned int SLang_getkey (void)
 	SLang_Input_Buffer_Len--;
 	imax = SLang_Input_Buffer_Len;
 
-	SLMEMCPY ((char *) SLang_Input_Buffer,
+	memmove ((char *) SLang_Input_Buffer,
 		(char *) (SLang_Input_Buffer + 1), imax);
      }
    else if (SLANG_GETKEY_ERROR == (ch = _pSLsys_getkey ())) return ch;
