Update .travis.yml

.travis.yml

@@ -104,6 +104,14 @@ matrix:
               - cmake .. -GNinja -DCMAKE_BUILD_TYPE=Debug
           script: ninja
           arch: ppc64le
+
+        - env: test="Android NDK (CMake)"
+          os: linux
+          language: android
+          android:
+            components:
+              - build-tools-25.0.2
+          arch: ppc64le
           install: 
               - echo y | sdkmanager "ndk-bundle"
               - echo y | sdkmanager "cmake;3.6.4111459"
@@ -153,5 +161,6 @@ addons:
             - m4
             - cmake
             - ninja-build
+            - ant
         sources:
             - ubuntu-toolchain-r-test