Link in src/tools/android to base_workspace.

This fixes #267 to some degree. An update to the tools/ directory will still be required.

--
MOS_MIGRATED_REVID=97228079

scripts/bootstrap/init_workspace.sh

diff --git a/scripts/bootstrap/init_workspace.sh b/scripts/bootstrap/init_workspace.sh
index fba6125..a6cc1a6 100755
--- a/scripts/bootstrap/init_workspace.sh
+++ b/scripts/bootstrap/init_workspace.sh
@@ -23,6 +23,9 @@
 rm -f "${base_workspace}/tools" && ln -s "$(pwd)/tools" "${base_workspace}/tools"
 rm -f "${base_workspace}/third_party" && ln -s "$(pwd)/third_party" "${base_workspace}/third_party"
 rm -f "${base_workspace}/examples" && ln -s "$(pwd)/examples" "${base_workspace}/examples"
+rm -f "${base_workspace}/src"
+mkdir -p ${base_workspace}/src/tools
+ln -s $(pwd)/src/tools/android ${base_workspace}/src/tools/android
 
 # Create a bazelrc file with the base_workspace directory in the package path.
 bazelrc='build --package_path %workspace%:'${base_workspace}