[dev.power64] .hgignore: update for the 9 toolchain

LGTM=dave, rsc
R=rsc, iant, dave
CC=golang-codereviews
https://golang.org/cl/124840043

.hgignore

@@ -2,13 +2,13 @@ syntax:glob
 .DS_Store
 .git
 .gitignore
-*.[568ao]
-*.a[568o]
+*.[5689ao]
+*.a[5689o]
 *.so
 *.pyc
 ._*
 .nfs.*
-[568a].out
+[5689a].out
 *~
 *.orig
 *.rej