configure.ac: Also match -androideabi tuple

On ARM Android platforms, the host_os tuple should be linux-androideabi,
so let's match both -android and -androideabi (or any other
-android* tuple) to determine if we should do an Android build.

Reviewed-by: Chad Versace <chadversary@chromium.org>
diff --git a/configure.ac b/configure.ac
index a614458..df3eb6b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -269,7 +269,7 @@
 AC_SUBST([DEFINES])
 android=no
 case "$host_os" in
-*-android)
+*-android*)
     android=yes
     ;;
 linux*|*-gnu*|gnu*|cygwin*)