Strings inside Lua are not fully aligned

Removed code to ensure that strings inside Lua (as returned by
'lua_tolstring') always start in fully aligned addresses.
Since version 5.3 the documentation does not ensure that.

lobject.h

@@ -350,21 +350,13 @@ typedef struct TString {
 } TString;
 
 
-/*
-** Ensures that address after this type is always fully aligned.
-*/
-typedef union UTString {
-  LUAI_MAXALIGN;  /* ensures maximum alignment for strings */
-  TString tsv;
-} UTString;
-
 
 /*
 ** Get the actual string (array of bytes) from a 'TString'.
 ** (Access to 'extra' ensures that value is really a 'TString'.)
 */
 #define getstr(ts)  \
-  check_exp(sizeof((ts)->extra), cast_charp((ts)) + sizeof(UTString))
+  check_exp(sizeof((ts)->extra), cast_charp((ts)) + sizeof(TString))
 
 
 /* get the actual string (array of bytes) from a Lua value */

lstring.h

@@ -19,7 +19,7 @@
 #define MEMERRMSG       "not enough memory"
 
 
-#define sizelstring(l)  (sizeof(union UTString) + ((l) + 1) * sizeof(char))
+#define sizelstring(l)  (sizeof(TString) + ((l) + 1) * sizeof(char))
 
 #define luaS_newliteral(L, s)	(luaS_newlstr(L, "" s, \
                                  (sizeof(s)/sizeof(char))-1))