Update lua from 5.1.1 to 5.1.5

This keeps all the SM patches intact, but applies the 5.1.5 fixes on
top. All newlines normalized to make diffing with upstream easier.

https://www.lua.org/bugs.html#5.1.2
https://www.lua.org/bugs.html#5.1.3
https://www.lua.org/bugs.html#5.1.4
https://www.lua.org/bugs.html#5.1.5

extern/lua-5.1/src/lobject.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lobject.h 25893 2007-04-21 20:08:12Z stevecheckoway $
+** $Id: lobject.h,v 2.20.1.2 2008/08/06 13:29:48 roberto Exp $
 ** Type definitions for Lua objects
 ** See Copyright Notice in lua.h
 */
@@ -208,7 +208,7 @@ typedef union TString {
 
 
 #define getstr(ts)	cast(const char *, (ts) + 1)
-#define svalue(o)       getstr(tsvalue(o))
+#define svalue(o)       getstr(rawtsvalue(o))