7197849: Update new build-infra makefiles

Reviewed-by: ihse, erikj, ohrstrom, tbell
diff --git a/.hgignore b/.hgignore
index 156055a..ee5ec91 100644
--- a/.hgignore
+++ b/.hgignore
@@ -1,6 +1,7 @@
 ^build/
 ^dist/
-/nbproject/private/
+nbproject/private/
 ^webrev
 ^.hgtip
+^.bridge2
 .DS_Store