Add third_party_android back to the cache directories to speedup travis.

.travis.yml

@@ -4,6 +4,7 @@ cache:
     - $HOME/.ccache
     - $HOME/.cache/pip
     - $TRAVIS_BUILD_DIR/build/third_party
+    - $TRAVIS_BUILD_DIR/build/third_party_android
 sudo: required
 dist: trusty
 os:

cmake/cblas.cmake

@@ -13,10 +13,6 @@
 # system paths.
 #
 
-if(USE_EIGEN_FOR_BLAS)
-  return()
-endif(USE_EIGEN_FOR_BLAS)
-
 set(CBLAS_FOUND OFF)
 
 ## Find MKLML First.

cmake/external/openblas.cmake

@@ -12,6 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+IF(USE_EIGEN_FOR_BLAS)
+    return()
+ENDIF(USE_EIGEN_FOR_BLAS)
+
 INCLUDE(cblas)
 
 IF(NOT ${CBLAS_FOUND})