Add supported_platforms to RPi.GPIO

Author: srittau

stubs/RPi.GPIO/METADATA.toml

@@ -2,7 +2,9 @@ version = "0.7.*"
 upstream_repository = "https://sourceforge.net/p/raspberry-gpio-python/code/"
 
 [tool.stubtest]
-# When stubtest tries to import this module:
-# error: RPi.GPIO failed to import. RuntimeError: This module can only be run on a Raspberry Pi!
+# This package is only supported on Raspberry Pi hardware, which identifies
+# itself as 'linux'. When run on other hardware, it raises a RuntimeError:
+# RPi.GPIO failed to import. RuntimeError: This module can only be run on a Raspberry Pi!
 # https://sourceforge.net/p/raspberry-gpio-python/code/ci/08048dd1894a6b09a104557b6eaa6bb68b6baac5/tree/source/py_gpio.c#l1008
 skip = true
+supported_platforms = ["linux"]