Since we're only using it on Linux now, just require poppler as a system dependency.

third_party/fontconfig/config/windows/dirent.h

Index: third_party/fontconfig/config/windows/dirent.h
diff --git a/third_party/fontconfig/config/windows/dirent.h b/third_party/fontconfig/config/windows/dirent.h
deleted file mode 100644
index a02a0d828a7605822f733228a3eeaf8a27d48509..0000000000000000000000000000000000000000
--- a/third_party/fontconfig/config/windows/dirent.h
+++ /dev/null
@@ -1,50 +0,0 @@
-#ifndef DIRENT_INCLUDED
-#define DIRENT_INCLUDED
-
-/*
-
-    Declaration of POSIX directory browsing functions and types for Win32.
-
-    Author:  Kevlin Henney (kevlin@acm.org, kevlin@curbralan.com)
-    History: Created March 1997. Updated June 2003.
-    Rights:  See end of file.
-    
-*/
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-typedef struct DIR DIR;
-
-struct dirent
-{
-    char *d_name;
-};
-
-DIR           *opendir(const char *);
-int           closedir(DIR *);
-struct dirent *readdir(DIR *);
-void          rewinddir(DIR *);
-
-/*
-
-    Copyright Kevlin Henney, 1997, 2003. All rights reserved.
-
-    Permission to use, copy, modify, and distribute this software and its
-    documentation for any purpose is hereby granted without fee, provided
-    that this copyright and permissions notice appear in all copies and
-    derivatives.
-    
-    This software is supplied "as is" without express or implied warranty.
-
-    But that said, if there are any problems please get in touch.
-
-*/
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif