Use re-packaged libalgobsec.a for ESP8266

Instead of relying on a patched arduino framework, we now rely on a patched library file as described in esphome/feature-requests#16 (comment) and implemented in trvrnrth/BSEC-Arduino-library@5ebd709

Hopefully this change can be made upstream in future.

src/.bsecsensor.yaml

@@ -5,12 +5,7 @@ esphome:
  includes: 
  - bsecsensor.h
  libraries:
- - bsec=https://github.com/BoschSensortec/BSEC-Arduino-library
- arduino_version: '2.7.4'
- platformio_options:
- # Use patched arduino to modify BSEC library memory location
- # https://github.com/BoschSensortec/BSEC-Arduino-library#4-additional-core-specific-modifications
- platform_packages: framework-arduinoespressif8266 @ https://github.com/trvrnrth/Arduino.git
+ - bsec=https://github.com/trvrnrth/BSEC-Arduino-library
 
 wifi:
  ssid: !secret wifi_ssid