increase default input line, from PLD Linux

(for as long as we still have the size static, and !MKSH_SMALL)

sh.h

@@ -175,7 +175,7 @@
 #endif
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.772 2016/05/17 15:36:34 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.773 2016/06/25 23:49:50 tg Exp $");
 #endif
 #define MKSH_VERSION "R52 2016/05/17"
 
@@ -1082,7 +1082,11 @@ EXTERN bool builtin_spec;
 EXTERN char	*current_wd;
 
 /* input line size */
+#ifdef MKSH_SMALL
 #define LINE		(4096 - ALLOC_OVERHEAD)
+#else
+#define LINE		(16384 - ALLOC_OVERHEAD)
+#endif
 /*
  * Minimum required space to work with on a line - if the prompt leaves
  * less space than this on a line, the prompt is truncated.