### Please describe the problem.
Android 5.0 (apparently) requires PIE executables. [You get "error: only position independent executables (PIE) are supported.")

### What steps will reproduce the problem?
Trying to start git annex (or the webapp) on android 5.0

### What version of git-annex are you using? On what operating system?
Currently nightly on Android 5.0 (Nexus 5)

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log


# End of transcript or log.
"""]]
