Add remotebranch attributes to temporarily workaround jiri

Jiri added a feature that will complain if you specify a revision that
is not on the same remotebranch that you specify.  This helps uncover
nonsensical configurations.  However, in the case where no remotebranch
is specified, `master` is assumed.

https://github.com/vanadium/issues/issues/1161

Change-Id: I82ba05c8867abbad1a85b140e5c75a7dcbc90a6b
diff --git a/mojo b/mojo
index bfc8eae..a9f5348 100644
--- a/mojo
+++ b/mojo
@@ -69,6 +69,7 @@
     <project name="third_party_leveldatabase_src"
              remote="https://chromium.googlesource.com/external/leveldb.git"
              path="src/third_party/leveldatabase/src"
+             remotebranch="reuse-manifest"
              revision="40c17c0b84ac0b791fb434096fd5c05f3819ad55"/>
     <project name="third_party_ffmpeg"
              remote="https://chromium.googlesource.com/chromium/third_party/ffmpeg.git"
@@ -93,6 +94,7 @@
     <project name="third_party_pyelftools"
              remote="https://chromium.googlesource.com/chromiumos/third_party/pyelftools.git"
              path="src/third_party/pyelftools"
+             remotebranch="master-0.22"
              revision="19b3e610c86fcadb837d252c794cb5e8008826ae"/>
     <project name="testing_gtest"
              remote="https://chromium.googlesource.com/external/googletest.git"