collective R54 release preparation multi-merger:

install both lksh and mksh manpages from Build.sh (Martijn Dekker)
spelling fixes (Larry Hynes)
manpage improvements (Martijn Dekker)
initial port to Harvey-OS’ APEX (Ronald G. Minnich, Elbing Miss, Álvaro Jurado)
more from komh’s OS/2 port (KO Myung-Hun)

var_spec.h

@@ -19,7 +19,7 @@
  */
 
 #if defined(VARSPEC_DEFNS)
-__RCSID("$MirOS: src/bin/mksh/var_spec.h,v 1.9 2016/07/25 21:02:13 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/var_spec.h,v 1.10 2016/11/11 23:31:39 tg Exp $");
 #define FN(name)			/* nothing */
 #elif defined(VARSPEC_ENUMS)
 #define FN(name)			V_##name,
@@ -40,13 +40,22 @@ F0(NONE)
 
 /* 1 and up are special variables */
 FN(BASHPID)
+#ifdef __OS2__
+FN(BEGINLIBPATH)
+#endif
 FN(COLUMNS)
+#ifdef __OS2__
+FN(ENDLIBPATH)
+#endif
 FN(EPOCHREALTIME)
 #if HAVE_PERSISTENT_HISTORY
 FN(HISTFILE)
 #endif
 FN(HISTSIZE)
 FN(IFS)
+#ifdef __OS2__
+FN(LIBPATHSTRICT)
+#endif
 FN(LINENO)
 FN(LINES)
 FN(OPTIND)