Canonicalize target filename when loading depfiles

gistfile1.diff

diff --git a/src/graph.cc b/src/graph.cc
index a4317ba..bbfb8df 100644
--- a/src/graph.cc
+++ b/src/graph.cc
@@ -148,8 +148,11 @@ bool Edge::LoadDepFile(State* state, DiskInterface* disk_interface,
     *err = "expected only one output";
     return false;
   }
-  if (outputs_[0]->file_->path_ != makefile.out_) {
-    *err = "expected makefile to mention '" + outputs_[0]->file_->path_ + "', "
+  string output_file_path = outputs_[0]->file_->path_;
+  if (!CanonicalizePath(&output_file_path, err))
+    return false;
+  if (output_file_path != makefile.out_) {
+    *err = "expected makefile to mention '" + output_file_path + "', "
            "got '" + makefile.out_ + "'";
     return false;
   }