CDRIVER-2587 use API_LEVEL=21

Author: kevinAlbs

.evergreen/config.yml

@@ -7374,11 +7374,11 @@ buildvariants:
   batchtime: 1440 # 1 day
   expansions:
     libmongocapi_cmake_flags: >-
-      -DANDROID_NATIVE_API_LEVEL=24
+      -DANDROID_NATIVE_API_LEVEL=21
       -DANDROID_ABI=arm64-v8a
       -DTHREADS_PTHREAD_ARG=2
-      -DCMAKE_TOOLCHAIN_FILE=$WORKDIR/android_sdk/ndk-bundle/build/cmake/android.toolchain.cmake
-      -DCMAKE_FIND_ROOT_PATH="$WORKDIR/android_toolchain"
+      -DCMAKE_TOOLCHAIN_FILE=./android_sdk/ndk-bundle/build/cmake/android.toolchain.cmake
+      -DCMAKE_FIND_ROOT_PATH="./android_toolchain"
       -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY
       -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY
       -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER
@@ -7397,11 +7397,11 @@ buildvariants:
   batchtime: 1440 # 1 day
   expansions:
     libmongocapi_cmake_flags: >-
-      -DANDROID_NATIVE_API_LEVEL=24
+      -DANDROID_NATIVE_API_LEVEL=21
       -DANDROID_ABI=x86_64
       -DTHREADS_PTHREAD_ARG=2
-      -DCMAKE_TOOLCHAIN_FILE=$WORKDIR/android_sdk/ndk-bundle/build/cmake/android.toolchain.cmake
-      -DCMAKE_FIND_ROOT_PATH=$WORKDIR/android_toolchain
+      -DCMAKE_TOOLCHAIN_FILE=./android_sdk/ndk-bundle/build/cmake/android.toolchain.cmake
+      -DCMAKE_FIND_ROOT_PATH=./android_toolchain
       -DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY
       -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY
       -DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=NEVER