update first class port section for Go 1.21, now that reproducibly-built toolchains are provided for all ports
diff --git a/PortingPolicy.md b/PortingPolicy.md
index d690817..ea64a78 100644
--- a/PortingPolicy.md
+++ b/PortingPolicy.md
@@ -29,17 +29,17 @@
# First class ports
-Some ports are considered "first class". The distinction is mostly about releases and distribution.
+Some ports are considered "first class". The distinction is mostly about releases.
A first class port has these properties:
* Broken builds block releases
* All contributors are effectively responsible for these ports (You break it, you fix it, or find someone who can.)
- * Official binaries are provided
* Requires Google's Go team to own the builder machine
* Installation is documented at https://go.dev/doc/install
-Graduating a port to "first class" is at the discretion of the Go team at Google.
+Graduating a port to "first class" is at the discretion of the Go team at Google,
+and requires an accepted proposal.
The current first class ports are:
@@ -52,8 +52,6 @@
* windows/386
* windows/amd64
-We distribute binaries for some other GOOS/GOARCH pairs (other "ports"), but they are not "first class" by this definition.
-
All Linux first class ports are for systems using glibc only. Linux systems using other C libraries are not fully supported and are not treated as first class.
# Maintaining a port
