armv7-linux-androideabi is a target

Closes rust-lang/rust#34581

Author: alexcrichton

master/build-rust-manifest.py

@@ -78,6 +78,7 @@
     "arm-unknown-linux-gnueabihf",
     "armv7-apple-ios",
     "armv7-unknown-linux-gnueabihf",
+    "armv7-linux-androideabi",
     "armv7s-apple-ios",
     "i386-apple-ios",
     "i686-apple-darwin",