build: updated Android NDK from r21 to r25b

Author: ErikBjare

install-ndk.sh

@@ -12,7 +12,7 @@ if [ -z "$ANDROID_NDK_HOME" ]; then
         echo "Found NDK folder in root, using."
     else
         echo 'ANDROID_NDK_HOME not set, downloading NDK...';
-        wget --no-verbose -O android-ndk.zip https://dl.google.com/android/repository/android-ndk-r21-linux-x86_64.zip;
+        wget --no-verbose -O android-ndk.zip https://dl.google.com/android/repository/android-ndk-r25b-linux.zip;
         unzip -q -d NDK android-ndk.zip;
         ls NDK;
         mv NDK/*/* NDK/;