Add support for Android (with termux) (#563)

Author: vincentkam

tree-sitter-langs-build.el

@@ -244,6 +244,7 @@ infrequent (grammar-only changes).  It is different from the version of
   (pcase system-type
     ('darwin "macos")
     ('gnu/linux "linux")
+    ('android "linux")
     ('berkeley-unix "freebsd")
     ('windows-nt "windows")
     (_ (error "Unsupported system-type %s" system-type))))