Test presence of remapped path

Author: cbeuw

Diff for: src/test/run-make-fulldeps/remap-path-prefix/Makefile

@@ -3,4 +3,5 @@
 # Checks if remapping works if the remap-from string contains path to the working directory plus more
 all:
 	$(RUSTC) --remap-path-prefix $$PWD/auxiliary=/the/aux --crate-type=lib --emit=metadata auxiliary/lib.rs
+	grep "/the/aux/lib.rs" $(TMPDIR)/liblib.rmeta || exit 1
 	! grep "$$PWD/auxiliary" $(TMPDIR)/liblib.rmeta || exit 1