Fix ddltool-failed test

Author: estebank

tests/ui/rfcs/rfc-2627-raw-dylib/dlltool-failed.stderr

@@ -1,6 +1,6 @@
 error: Dlltool could not create import library with $DLLTOOL -d $DEF_FILE -D foo.dll -l $LIB_FILE $TARGET_MACHINE $ASM_FLAGS --no-leading-underscore $TEMP_PREFIX:
 
-       $DLLTOOL: Syntax error in def file $DEF_FILE:1
+       $DLLTOOL: Syntax error in def file $DEF_FILE:1␍
 
 error: aborting due to 1 previous error