Pass bindgen location to bindgen.sh

bindgen.sh needs to be passed the location of bindgen as the installed
version is not necessarily available

Test: cd external/rust/crates/libsqlite3-sys; mma
Change-Id: I93d2dcbc67d1ff82419d913bb12b68771ba08f0a
diff --git a/Android.bp b/Android.bp
index e007749..ed10b09 100644
--- a/Android.bp
+++ b/Android.bp
@@ -155,7 +155,7 @@
 // to detect and fix errors.
 bindgen_post_edit_cmd = " sed -i 's/: u32 /: i32 /' $(out) &&"
 
-genrule_default_cmd = "$(location bindgen.sh)"
+genrule_default_cmd = "$(location bindgen.sh) $(location bindgen)"
     + sqlite3_bindgen_flags
     + common_bindgen_flags
     + sqlite3_bindgen_clang_flags