.hgignore: add *.cgo*.{c,go}

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4168059
diff --git a/.hgignore b/.hgignore
index 453a712..59aeeeb 100644
--- a/.hgignore
+++ b/.hgignore
@@ -15,6 +15,8 @@
 *.exe
 .*.swp
 core
+*.cgo*.go
+*.cgo*.c
 _cgo_*
 _obj
 _test