add luaposix crypt() support

contrib/luaposix/patches/200-crypt.patch

@@ -0,0 +1,66 @@
+Index: luaposix-5.1.2/lposix.c
+===================================================================
+--- luaposix-5.1.2.orig/lposix.c	2008-06-02 17:35:21.000000000 +0200
++++ luaposix-5.1.2/lposix.c	2008-06-02 17:35:26.000000000 +0200
+@@ -1006,6 +1006,29 @@
+ }
+ #endif
+ 
++/*
++ * XXX: GNU and BSD handle the forward declaration of crypt() in different
++ * and annoying ways (especially GNU). Declare it here just to make sure
++ * that it's there
++ */
++char *crypt(const char *, const char *);
++
++static int Pcrypt(lua_State *L)
++{
++	const char *str, *salt;
++	char *res;
++
++	str = luaL_checkstring(L, 1);
++	salt = luaL_checkstring(L, 2);
++	if (strlen(salt) < 2)
++		luaL_error(L, "not enough salt");
++
++	res = crypt(str, salt);
++	lua_pushstring(L, res);
++
++	return 1;
++}
++
+ static const luaL_reg R[] =
+ {
+ 	{"access",		Paccess},
+@@ -1013,6 +1036,7 @@
+ 	{"chdir",		Pchdir},
+ 	{"chmod",		Pchmod},
+ 	{"chown",		Pchown},
++	{"crypt",		Pcrypt},
+ 	{"ctermid",		Pctermid},
+ 	{"dirname",		Pdirname},
+ 	{"dir",			Pdir},
+Index: luaposix-5.1.2/Makefile
+===================================================================
+--- luaposix-5.1.2.orig/Makefile	2008-06-02 17:35:26.000000000 +0200
++++ luaposix-5.1.2/Makefile	2008-06-02 17:35:18.000000000 +0200
+@@ -37,8 +37,10 @@
+ OS=$(shell uname)
+ ifeq ($(OS),Darwin)
+   LDFLAGS_SHARED=-bundle -undefined dynamic_lookup
++  LIBS=
+ else
+   LDFLAGS_SHARED=-shared
++  LIBS=-lcrypt
+ endif
+ 
+ # targets
+@@ -50,7 +52,7 @@
+ 	$(LUA) test.lua
+ 
+ $T:	$(OBJS)
+-	$(CC) $(LDFLAGS) -o $@ $(LDFLAGS_SHARED) $(OBJS)
++	$(CC) $(LDFLAGS) -o $@ $(LDFLAGS_SHARED) $(OBJS) $(LIBS)
+ 
+ $(OBJS): modemuncher.c
+