Correct test which wasn't failing correctly

Author: cbeuw

src/test/run-make-fulldeps/split-dwarf/Makefile

@@ -5,11 +5,11 @@
 all: packed remapped
 
 remapped:
-	$(RUSTC) -Z unstable-options -C split-debuginfo=packed -C debuginfo=2 --remap-path-prefix $$PWD=/a foo.rs -g
-	objdump -Wi $(TMPDIR)/foo | grep $$PWD && exit 1 || exit 0
+	$(RUSTC) -Z unstable-options -C split-debuginfo=packed -C debuginfo=2 --remap-path-prefix $(TMPDIR)=/a foo.rs -g
+	objdump -Wi $(TMPDIR)/foo | grep DW_AT_GNU_dwo_name | (! grep $(TMPDIR)) || exit 1
 
-	$(RUSTC) -Z unstable-options -C split-debuginfo=unpacked -C debuginfo=2 --remap-path-prefix $$PWD=/a foo.rs -g
-	objdump -Wi $(TMPDIR)/foo | grep $$PWD && exit 1 || exit 0
+	$(RUSTC) -Z unstable-options -C split-debuginfo=unpacked -C debuginfo=2 --remap-path-prefix $(TMPDIR)=/a foo.rs -g
+	objdump -Wi $(TMPDIR)/foo | grep DW_AT_GNU_dwo_name | (! grep $(TMPDIR)) || exit 1
 
 packed:
 	$(RUSTC) -Z unstable-options -C split-debuginfo=packed -C debuginfo=2 foo.rs -g