workaround some warnings from libmemcache

- as libmemcache isn't maintained anymore, it is unlikely
   the function signature get fixed (should be const char* instead of char*)


git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2413 152afb58-edef-0310-8abb-c4023f1b3aa9

src/mod_cml_funcs.c

@@ -211,7 +211,7 @@ int f_memcache_exists(lua_State *L) {
 	}
 
 	if (NULL == (r = mc_aget(mc,
-				 lua_tostring(L, 1), lua_strlen(L, 1)))) {
+				 (char*) lua_tostring(L, 1), lua_strlen(L, 1)))) {
 
 		lua_pushboolean(L, 0);
 		return 1;
@@ -248,7 +248,7 @@ int f_memcache_get_string(lua_State *L) {
 	}
 
 	if (NULL == (r = mc_aget(mc,
-				 lua_tostring(L, 1), lua_strlen(L, 1)))) {
+				 (char*) lua_tostring(L, 1), lua_strlen(L, 1)))) {
 		lua_pushnil(L);
 		return 1;
 	}
@@ -285,7 +285,7 @@ int f_memcache_get_long(lua_State *L) {
 	}
 
 	if (NULL == (r = mc_aget(mc,
-				 lua_tostring(L, 1), lua_strlen(L, 1)))) {
+				 (char*) lua_tostring(L, 1), lua_strlen(L, 1)))) {
 		lua_pushnil(L);
 		return 1;
 	}