Update docs

Author: ThomasFarstrike

docs/building/esp32.md

@@ -18,6 +18,12 @@ git clone https://github.com/MicroPythonOS/lvgl_micropython
 echo "  espressif/esp32-camera:
     git: https://github.com/MicroPythonOS/esp32-camera" >> lvgl_micropython/lib/micropython/ports/esp32/main/idf_component.yml
 
+echo 'include("$(MPY_DIR)/extmod/asyncio") # This is needed to have asyncio, which is used by aiohttp, which has easy to use websockets' >> lvgl_micropython/lib/micropython/ports/unix/variants/manifest.py
+
+# Unix builds need this as they don't handle C_
+ln -s ../../secp256k1-embedded-ecdh lvgl_micropython/ext_mod/secp256k1-embedded-ecdh
+ln -s ../../MicroPythonOS/c_mpos lvgl_micropython/ext_mod/c_mpos
+
 git clone https://github.com/cnadler86/micropython-camera-API
 pushd micropython-camera-API/
 git checkout v0.4.0