subsystem: allow gyp as a subsystem (#65)

sam-github · joyeecheung · commit 5740678ce16b · 2019-07-09T02:25:32.000+08:00
`gyp:` has been used as subsystem tag 30 times for tools/gyp
diff --git a/lib/rules/subsystem.js b/lib/rules/subsystem.js
@@ -11,6 +11,7 @@ const validSubsystems = [
 , 'errors'
 , 'etw'
 , 'esm'
+, 'gyp'
 , 'inspector'
 , 'lib'
 , 'loader'
