Fix compilation

tasmota/lvgl_berry/tasmota_lv_stdlib.h

@@ -0,0 +1,20 @@
+/*
+  tasmota_lv_stdlib.h - internationalization for Tasmota
+  Copyright (C) 2021  Theo Arends
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+// replacement for <stdlib.h> used for PSRAM malloc in LVGL
+
+extern void *lvbe_malloc(size_t size);
+extern void  lvbe_free(void *ptr);
+extern void *lvbe_realloc(void *ptr, size_t size);