Cache new git deps in Travis

We start hitting 502 errors on some recently added repos
because they have not been added to travis cache.

TBR:fmayer
Change-Id: I91aeaa3c2417980a372be0ae5bd419038801f785
diff --git a/.travis.yml b/.travis.yml
index 7d222aa..ed23ecc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -116,16 +116,19 @@
 cache:
   timeout: 1800  # 30 mins
   directories:
+    - buildtools/android-core
     - buildtools/benchmark
+    - buildtools/bionic
     - buildtools/emulator
     - buildtools/googletest
     - buildtools/jsoncpp
     - buildtools/libbacktrace
-    - buildtools/linenoise
     - buildtools/libcxx
     - buildtools/libcxxabi
     - buildtools/libfuzzer
     - buildtools/libunwind
+    - buildtools/linenoise
+    - buildtools/lzma
 
 before_install:
   - set -e