add Lua 5.4.6 patches

external/lua/patches/lua-5.4.6-iolib-istty.diff

@@ -0,0 +1,57 @@
+--- liolib.c
++++ liolib.c
+@@ -4,6 +4,12 @@
+ ** See Copyright Notice in lua.h
+ */
+ 
++/***
++ * Input and output facilities.
++ *
++ * @module io
++ */
++
+ #define liolib_c
+ #define LUA_LIB
+ 
+@@ -16,6 +22,7 @@
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
++#include <unistd.h>
+ 
+ #include "lua.h"
+ 
+@@ -723,8 +730,25 @@
+   return luaL_fileresult(L, res == 0, NULL);
+ }
+ 
++/***
++ * Returns whether the stream points to a valid TTY device.
++ *
++ * @function file:istty
++ * @usage
++local f = io.open("/etc/fstab", 'r');
++-- a regular file will never be a TTY device
++assert(not f:istty())
++-- stdin, stdout and stderr can often be TTYs
++print(io.stdout:istty())
++ */
++static int f_istty (lua_State *L) {
++  int fd = fileno(tofile(L));
++  lua_pushboolean(L, isatty(fd));
++  return 1;
++}
+ 
+ 
++
+ static int io_flush (lua_State *L) {
+   return luaL_fileresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
+ }
+@@ -765,6 +789,7 @@
+   {"seek", f_seek},
+   {"close", f_close},
+   {"setvbuf", f_setvbuf},
++  {"istty", f_istty},
+   {NULL, NULL}
+ };
+ 

external/lua/patches/lua-5.4.6-makefile.diff

@@ -0,0 +1,18 @@
+--- Makefile
++++ Makefile
+@@ -6,12 +6,12 @@
+ # Your platform. See PLATS for possible values.
+ PLAT= guess
+
+-CC= gcc -std=gnu99
+-CFLAGS= -O2 -Wall -Wextra -DLUA_COMPAT_5_3 $(SYSCFLAGS) $(MYCFLAGS)
++CC= cc -std=c99
++CFLAGS= -O2 $(SYSCFLAGS) $(MYCFLAGS)
+ LDFLAGS= $(SYSLDFLAGS) $(MYLDFLAGS)
+ LIBS= -lm $(SYSLIBS) $(MYLIBS)
+ 
+-AR= ar rcu
++AR= ar cr
+ RANLIB= ranlib
+ RM= rm -f
+ UNAME= uname

external/lua/patches/lua-5.4.6-oslib-hostname.diff

@@ -0,0 +1,58 @@
+--- loslib.c
++++ loslib.c
+@@ -4,6 +4,12 @@
+ ** See Copyright Notice in lua.h
+ */
+ 
++/***
++ * Operating system related facilities.
++ *
++ * @module os
++ */
++
+ #define loslib_c
+ #define LUA_LIB
+ 
+@@ -14,6 +20,7 @@
+ #include <locale.h>
+ #include <stdlib.h>
+ #include <string.h>
++#include <unistd.h>
+ #include <time.h>
+ 
+ #include "lua.h"
+@@ -401,7 +408,26 @@
+   return 0;
+ }
+ 
++#define HOST_NAME_MAX 256 /* according to POSIX */
+ 
++/***
++ * Returns the system hostname.
++ *
++ * @function hostname
++ * @usage local hostname = os.hostname()
++ */
++static int
++os_hostname(lua_State *L)
++{
++	char buffer[HOST_NAME_MAX];
++
++	gethostname(buffer, HOST_NAME_MAX); /* get hostname */
++	lua_pushstring(L, buffer);
++
++    return 1;
++}
++
++
+ static const luaL_Reg syslib[] = {
+   {"clock",     os_clock},
+   {"date",      os_date},
+@@ -409,6 +435,7 @@
+   {"execute",   os_execute},
+   {"exit",      os_exit},
+   {"getenv",    os_getenv},
++  {"hostname",  os_hostname},
+   {"remove",    os_remove},
+   {"rename",    os_rename},
+   {"setlocale", os_setlocale},