More edits to the linux build instructions.

docs/android_build_instructions.md

Index: docs/android_build_instructions.md
diff --git a/docs/android_build_instructions.md b/docs/android_build_instructions.md
index 5fa56d36ce91f4b1bf1097043baa6a0063e0f9fa..22c7ef85244209011dd8d246df746df953ac8207 100644
--- a/docs/android_build_instructions.md
+++ b/docs/android_build_instructions.md
@@ -98,6 +98,10 @@ to get all of the dependencies you need to build on Linux, *plus* all of the
 Android-specific dependencies (you need some of the regular Linux dependencies
 because an Android build includes a bunch of the Linux tools and utilities).
 
+*** aside
+If you're running Debian, you'll also need to install the package `lib32z1`.
+***
+
 ### Run the hooks
 
 Once you've run `install-build-deps` at least once, you can now run the