With thanks to adg who lent me a copy of his release notes formatting
script, here are the changes between rc1 and rc2
* C: add Jeremiah Harmsen (Google CLA).
* cmd/cgo: correct pragma name in comment.
* cmd/ld: add .note.GNU-stack section for external linking (thanks Shenghou Ma),
fix SDYNIMPORT symbol test (thanks Alex Brainman),
fix another unsigned value causing bugs on Plan 9,
fix syms that are both cgo_import_static & cgo_import_dynamic.
* database/sql: remove an unused field from Rows.
* doc: add FAQ entry about language changes,
fix formatting in effective go code snippet,
link to Go 1.1 release notes,
only U+FEFF is a byte-order mark; U+FFFE is not.
* go/build: document GOOS.go also has implicit GOOS build constraint
(thanks Shenghou Ma).
* go/doc/example: Fix bug causing false negatives for Example playability.
* image/png: fix error message to not return width twice.
* libmach: fix build on Plan 9 (thanks David du Colombier).
* net: do not call syscall.Bind twice on windows (thanks Alex Brainman).
* regexp: doc fix.
* runtime/cgo: export symbols in both internal and external link mode.
* runtime: fix crash in badsignal(),
reduce max arena size on windows/amd64 to 32 GiB (thanks Shenghou Ma).
* syscall: fix prototype of Fchflags (API change) (thanks Shenghou Ma).
* text/template: comment fix.