a cleaner way to add variants - no longer need symlinks in adafruit proj

platformio.ini

@@ -186,6 +186,9 @@ board = nrf52840_dk
 [env:nrf52840dk-geeksville]
 extends = nrf52_base
 board = nrf52840_dk_modified
+# add our variants files to the include and src paths
+build_flags = ${nrf52_base.build_flags} -Ivariants/pca10056-rc-clock
+src_filter = ${nrf52_base.src_filter} +<../variants/pca10056-rc-clock>
 
 ; Note: By default no lora device is created for this build - it uses a simulated interface
 [env:feather_nrf52832]
@@ -216,6 +219,9 @@ lib_deps =
 [env:lora-relay-v1]
 extends = nrf52_base
 board = lora-relay-v1
+# add our variants files to the include and src paths
+build_flags = ${nrf52_base.build_flags} -Ivariants/lora_relay_v1
+src_filter = ${nrf52_base.src_filter} +<../variants/lora_relay_v1>
 lib_deps = 
   ${env.lib_deps}
   SparkFun BQ27441 LiPo Fuel Gauge Arduino Library