ci: Build depends only once for Android build

Depends is currently built twice for the Android build. For example, the
same task building it twice:

* https://cirrus-ci.com/task/6673185279049728?logs=ci#L3418 (aarch64-linux-android)
* https://cirrus-ci.com/task/6673185279049728?logs=ci#L3422 (x86_64-pc-linux-gnu, 4 lines later)

Author: MarcoFalke

ci/test/00_setup_env_android.sh

@@ -6,12 +6,20 @@
 
 export LC_ALL=C.UTF-8
 
-export CONTAINER_NAME=ci_android
+export HOST=aarch64-linux-android
 export PACKAGES="clang llvm unzip openjdk-8-jdk gradle"
+export CONTAINER_NAME=ci_android
+export DOCKER_NAME_TAG="ubuntu:bionic"
+
+export RUN_UNIT_TESTS=false
+export RUN_FUNCTIONAL_TESTS=false
 
 export ANDROID_API_LEVEL=28
 export ANDROID_BUILD_TOOLS_VERSION=28.0.3
 export ANDROID_NDK_VERSION=21.1.6352462
 export ANDROID_TOOLS_URL=https://dl.google.com/android/repository/commandlinetools-linux-6609375_latest.zip
+export ANDROID_HOME="${DEPENDS_DIR}/SDKs/android"
+export ANDROID_NDK_HOME="${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}"
+export DEP_OPTS="ANDROID_SDK=${ANDROID_HOME} ANDROID_NDK=${ANDROID_NDK_HOME} ANDROID_API_LEVEL=${ANDROID_API_LEVEL} ANDROID_TOOLCHAIN_BIN=${ANDROID_NDK_HOME}/toolchains/llvm/prebuilt/linux-x86_64/bin/"
 
-export BITCOIN_CONFIG="--disable-ccache"
+export BITCOIN_CONFIG="--disable-ccache"

ci/test/05_before_script.sh

@@ -24,16 +24,11 @@ fi
 
 if [ -n "$ANDROID_TOOLS_URL" ]; then
   ANDROID_TOOLS_PATH=$DEPENDS_DIR/sdk-sources/android-tools.zip
-  ANDROID_HOME="$DEPENDS_DIR"/SDKs/android
-  ANDROID_NDK_HOME=${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}
 
   DOCKER_EXEC curl --location --fail "${ANDROID_TOOLS_URL}" -o "$ANDROID_TOOLS_PATH"
   DOCKER_EXEC mkdir -p "${ANDROID_HOME}/cmdline-tools"
   DOCKER_EXEC unzip -o "$ANDROID_TOOLS_PATH" -d "${ANDROID_HOME}/cmdline-tools"
   DOCKER_EXEC "yes | ${ANDROID_HOME}/cmdline-tools/tools/bin/sdkmanager --install \"build-tools;${ANDROID_BUILD_TOOLS_VERSION}\" \"platform-tools\" \"platforms;android-${ANDROID_API_LEVEL}\" \"ndk;${ANDROID_NDK_VERSION}\""
-
-  MAKE_COMMAND="ANDROID_SDK=${ANDROID_HOME} ANDROID_NDK=${ANDROID_NDK_HOME} make $MAKEJOBS -C depends HOST=aarch64-linux-android ANDROID_API_LEVEL=${ANDROID_API_LEVEL} ANDROID_TOOLCHAIN_BIN=${ANDROID_HOME}/ndk/${ANDROID_NDK_VERSION}/toolchains/llvm/prebuilt/linux-x86_64/bin/ $DEP_OPTS"
-  DOCKER_EXEC "$MAKE_COMMAND" HOST=aarch64-linux-android
 fi
 
 if [[ ${USE_MEMORY_SANITIZER} == "true" ]]; then