test: show full deps instead of grepping for predicate

Print the full deps output (minus the External compiler path) rather
than grepping for 'predicate'. This makes the test more transparent
about what deps are declared.

Signed-off-by: Robin Bate Boerop <me@robinbb.com>

Author: robinbb

test/blackbox-tests/test-cases/per-module-lib-deps/lib-deps-preserved.t

@@ -33,10 +33,25 @@ dependencies' .cmi files.
 
   $ dune build ./main.exe
 
-Both modules declare glob deps on mylib's .cmi files:
-
-  $ dune rules --deps _build/default/.main.eobjs/native/dune__exe__Uses_lib.cmx 2>&1 | grep 'predicate'
+Both modules declare deps on mylib's .cmi files:
+
+  $ dune rules --deps _build/default/.main.eobjs/native/dune__exe__Uses_lib.cmx 2>&1 | grep -v External
+  ((File
+   (File (In_build_dir _build/default/.main.eobjs/byte/dune__exe.cmi))
+   (File (In_build_dir _build/default/.main.eobjs/byte/dune__exe__Uses_lib.cmi))
+   (File (In_build_dir _build/default/uses_lib.ml))
+   (glob
+    ((dir (In_build_dir _build/default/lib/.mylib.objs/byte))
      (predicate *.cmi)
-
-  $ dune rules --deps _build/default/.main.eobjs/native/dune__exe__Main.cmx 2>&1 | grep 'predicate'
+     (only_generated_files false))))
+
+  $ dune rules --deps _build/default/.main.eobjs/native/dune__exe__Main.cmx 2>&1 | grep -v External
+  ((File
+   (File (In_build_dir _build/default/.main.eobjs/byte/dune__exe.cmi))
+   (File (In_build_dir _build/default/.main.eobjs/byte/dune__exe__Main.cmi))
+   (File (In_build_dir _build/default/.main.eobjs/byte/dune__exe__Uses_lib.cmi))
+   (File (In_build_dir _build/default/main.ml))
+   (glob
+    ((dir (In_build_dir _build/default/lib/.mylib.objs/byte))
      (predicate *.cmi)
+     (only_generated_files false))))