title: AOSP build failure (undefined modules)
body: <p>I've set up the AOSP master branch on my machine and have tried to build using the following steps:</p>
  
  <pre><code>source build/envsetup.sh
  lunch aosp_bullhead-userdebug
  make -j4
  </code></pre>
  
  <p>Here is the output of make:</p>
  
  <pre><code>============================================
  PLATFORM_VERSION_CODENAME=P
  PLATFORM_VERSION=P
  TARGET_PRODUCT=aosp_bullhead
  TARGET_BUILD_VARIANT=userdebug
  TARGET_BUILD_TYPE=release
  TARGET_ARCH=arm64
  TARGET_ARCH_VARIANT=armv8-a
  TARGET_CPU_VARIANT=cortex-a53
  TARGET_2ND_ARCH=arm
  TARGET_2ND_ARCH_VARIANT=armv8-a
  TARGET_2ND_CPU_VARIANT=cortex-a53.a57
  HOST_ARCH=x86_64
  HOST_2ND_ARCH=x86
  HOST_OS=linux
  HOST_OS_EXTRA=Linux-4.13.0-37-generic-x86_64-Ubuntu-16.04.3-LTS
  HOST_CROSS_OS=windows
  HOST_CROSS_ARCH=x86
  HOST_CROSS_2ND_ARCH=x86_64
  HOST_BUILD_TYPE=release
  BUILD_ID=OC-MR1
  OUT_DIR=out
  ============================================`
  ninja: no work to do.
  [1/1] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja
  FAILED: out/soong/build.ninja
  out/soong/.bootstrap/bin/soong_build -t -l 
  out/.module_paths/Android.bp.list -b out/soong -n out -d 
  out/soong/build.ninja.d -o out/soong/build.ninja Android.bp
  error: development/build/Android.bp:30:1: "android_stubs_current" depends on undefined module "api-stubs-docs"
  error: development/build/Android.bp:38:1: "android_system_stubs_current" depends on undefined module "system-api-stubs-docs"
  error: development/build/Android.bp:46:1: "android_test_stubs_current" depends on undefined module "test-api-stubs-docs"
  ninja: build stopped: subcommand failed.
  10:39:54 soong bootstrap failed with: exit status 1
  #### failed to build some targets (4 seconds) ####
  </code></pre>
  
  <p>The version of Java that is being used is the bundled openjdk 9 (The same error occurs with openjdk 8)</p>
  
  <pre><code>java -version
  
  openjdk version "9"
  OpenJDK Runtime Environment (build 9+181-android4627429)
  OpenJDK 64-Bit Server VM (build 9+181-android4627429, mixed mode)
  </code></pre>