Add sh_binary[_host] for shell script that should be installed as executable

We've been putting these in cc_prebuilt_binary, but that's not really
correct. It also tries adding '.exe' to the end of windows executables,
which isn't desirable for bat files.

Test: Use sh_binary_host
Change-Id: Idd5418dceb81ac55b766c987fbb69a810aeb8a3b
diff --git a/Android.bp b/Android.bp
index 3215fa2..a70f73c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -61,6 +61,7 @@
         "android/prebuilt_etc.go",
         "android/proto.go",
         "android/register.go",
+        "android/sh_binary.go",
         "android/singleton.go",
         "android/testing.go",
         "android/util.go",