strings: deprecate strcpy_overlap

This functions is a crapy workaround and shoud not be used anymore.

psys/include/p2c/strings.h

@@ -50,7 +50,7 @@ extern void strcomment (char *s, char* bracket);
 extern void strcompress (char *s, char *chars, int all);
 extern void strdispose (char **sp);
 extern void strchange (char** sp, char *);
-extern char *strcpy_overlap(char *dst, char *src);
+extern char *strcpy_overlap(char *dst, char *src) DEPRECATED;
 
 #endif