Add support for Android 2.3+

There have been plenty of ppl involved in creating this version.
I don't wanna mention names as I'm sure I'd forget someone so I
just tell where help has been done:
- The partial android versions done by various ppl
- Testing on different android devices
- reviewing code (especially the in core changes)
- testing controls
- reviewing texts

A big thank you to everyone helping this to be completed!

src/lua/src/llex.c

@@ -176,9 +176,15 @@ static void buffreplace (LexState *ls, char from, char to) {
 
 static void trydecpoint (LexState *ls, SemInfo *seminfo) {
   /* format error: try to update decimal point separator */
+#ifndef __ANDROID__
   struct lconv *cv = localeconv();
+#endif
   char old = ls->decpoint;
+#ifndef __ANDROID__
   ls->decpoint = (cv ? cv->decimal_point[0] : '.');
+#else
+  ls->decpoint = '.';
+#endif
   buffreplace(ls, old, ls->decpoint);  /* try updated decimal separator */
   if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) {
     /* format error with correct decimal point: no more options */