'setCstacklimit' renamed to 'setcstacklimit'

Function names in the API use only lowercase letters.

ldblib.c

@@ -437,9 +437,9 @@ static int db_traceback (lua_State *L) {
 }
 
 
-static int db_setCstacklimit (lua_State *L) {
+static int db_setcstacklimit (lua_State *L) {
   int limit = (int)luaL_checkinteger(L, 1);
-  int res = lua_setCstacklimit(L, limit);
+  int res = lua_setcstacklimit(L, limit);
   if (res == 0)
     lua_pushboolean(L, 0);
   else
@@ -465,7 +465,7 @@ static const luaL_Reg dblib[] = {
   {"setmetatable", db_setmetatable},
   {"setupvalue", db_setupvalue},
   {"traceback", db_traceback},
-  {"setCstacklimit", db_setCstacklimit},
+  {"setcstacklimit", db_setcstacklimit},
   {NULL, NULL}
 };