Split native build into a cross-platform target vs a linux only target

platformio.ini

@@ -425,13 +425,24 @@ lib_deps =
   SparkFun BQ27441 LiPo Fuel Gauge Arduino Library
   TFT_eSPI
 
-; The Portduino based sim environment on top of linux
+; The Portduino based sim environment on top of any host OS, all hardware will be simulated
 [env:native]
 platform = https://github.com/geeksville/platform-native.git 
 src_filter = ${env.src_filter} -<esp32/> -<nimble/> -<nrf52/> -<mesh/http/> -<plugins/esp32>
-build_flags = ${arduino_base.build_flags} -O0 -lgpiod -Llinux/lib -Ilinux/include
+build_flags = ${arduino_base.build_flags} -O0 
 framework = arduino
-board = native
+board = cross_platform
+lib_deps =
+  ${arduino_base.lib_deps}
+  rweather/Crypto
+
+; The Portduino based sim environment on top of a linux OS and touching linux hardware devices
+[env:linux]
+platform = https://github.com/geeksville/platform-native.git 
+src_filter = ${env.src_filter} -<esp32/> -<nimble/> -<nrf52/> -<mesh/http/> -<plugins/esp32>
+build_flags = ${arduino_base.build_flags} -O0 -lgpiod 
+framework = arduino
+board = linux_hardware
 lib_deps =
   ${arduino_base.lib_deps}
   rweather/Crypto