Fix a portability issue with md_hasclreol().

Some games' implementation of md_hasclreol() poked around in ncurses
internals, which does not work for some ncurses build configuration.
Most games did not actually call md_hasclreol(), so it was removed.
There is a standard terminfo function which can retrieve the value of
the clr_eol capability, so this was used for rogue5.

urogue/mdport.c

@@ -103,18 +103,6 @@ md_init()
 #endif
 }
 
-int
-md_hasclreol()
-{
-#ifndef	attron
-    return(!CE);
-#elif !defined(__PDCURSES__)
-    return(clr_eol != NULL);
-#else
-    return(TRUE);
-#endif
-}
-
 #ifdef	attron
 # define	_puts(s)	tputs(s, 0, putchar);
 # define	SO		enter_standout_mode