Add host tag to Python install path.

Bug: http://b/26875911
Change-Id: Ie8f5edcca6755cf8a74b1db7bf1af23773427c30
diff --git a/build/tools/common-build-host-funcs.sh b/build/tools/common-build-host-funcs.sh
index 4e07fa8..df9631b 100644
--- a/build/tools/common-build-host-funcs.sh
+++ b/build/tools/common-build-host-funcs.sh
@@ -805,7 +805,7 @@
 #  python_ndk_install_dir with nothing.
 python_build_install_dir ()
 {
-    echo "$BH_BUILD_DIR/install/host-tools"
+    echo "$BH_BUILD_DIR/$1/install/host-tools"
 }
 
 # Same as python_build_install_dir, but for the final NDK installation