Problem: Android CI NDK version out of date

Solution: update CI scripts to use newer r11c from r10e

builds/android/android_build_helper.sh

@@ -75,12 +75,12 @@ function android_build_env {
     
     if [ -z "$ANDROID_NDK_ROOT" ]; then
         ANDROID_BUILD_FAIL+=("Please set the ANDROID_NDK_ROOT environment variable")
-        ANDROID_BUILD_FAIL+=("  (eg. \"/home/user/android/android-ndk-r9d\")")
+        ANDROID_BUILD_FAIL+=("  (eg. \"/home/user/android/android-ndk-r11c\")")
     fi
     
     if [ -z "$TOOLCHAIN_PATH" ]; then
         ANDROID_BUILD_FAIL+=("Please set the TOOLCHAIN_PATH environment variable")
-        ANDROID_BUILD_FAIL+=("  (eg. \"/home/user/android/android-ndk-r9d/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin\")")
+        ANDROID_BUILD_FAIL+=("  (eg. \"/home/user/android/android-ndk-r11c/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin\")")
     fi
     
     if [ -z "$TOOLCHAIN_NAME" ]; then

builds/android/ci_build.sh

 #!/usr/bin/env bash
 
-NDK_VER=android-ndk-r10e
+NDK_VER=android-ndk-r11c
 NDK_ABI_VER=4.9
 
 if [ $TRAVIS_OS_NAME == "linux" ]
@@ -14,12 +14,11 @@ else
     exit 1
 fi
 
-export FILENAME=$NDK_VER-$NDK_PLATFORM.bin
+export FILENAME=$NDK_VER-$NDK_PLATFORM.zip
 
 (cd '/tmp' \
-    && wget http://dl.google.com/android/ndk/$FILENAME \
-    && chmod a+x $FILENAME \
-    && ./$FILENAME &> /dev/null ) || exit 1
+    && wget http://dl.google.com/android/repository/$FILENAME \
+    && unzip $FILENAME &> /dev/null ) || exit 1
 unset FILENAME
 
 export ANDROID_NDK_ROOT="/tmp/$NDK_VER"