### Please describe the problem.
Install recent lineageOS Android on Samsung Galaxy S devices (tested with SGS4, SGS5, SGS9) fails due to incorrect arch string test in 'git-annex-install'.

### What steps will reproduce the problem?
Try to install git-annex, Android version.

### What version of git-annex are you using? On what operating system?
Recent git-annex-install pulled with wget as detailed here: 
<https://git-annex.branchable.com/Android/#index1h2>

### Please provide any additional information below.
Patch below:
[[!format sh """
--- git-annex-install_org       2019-03-20 17:51:58.216525055 +0100
+++ git-annex-install   2019-03-20 17:52:06.224653964 +0100
@@ -18,7 +18,7 @@
        arm)
                arch=armel
                ;;
-       armv71)
+       armv7l)
                arch=armel
                ;;
        x86_64)
"""]]

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)
Sure, love it! :)

> Lo1! Thanks for the patch. [[done]] --[[Joey]]
