Define mutex, file_map

The statics were declared in the header but never defined in a
translation unit.

Author: cbracken

fml/unique_fd.cc

@@ -13,6 +13,9 @@ namespace internal {
 
 namespace os_win {
 
+std::mutex UniqueFDTraits::file_map_mutex;
+std::map<HANDLE, DirCacheEntry> UniqueFDTraits::file_map;
+
 void UniqueFDTraits::Free_Handle(HANDLE fd) {
   CloseHandle(fd);
 }

fml/unique_fd.h

@@ -34,8 +34,8 @@ struct DirCacheEntry {
 // else linker error.  Embedding in struct also causes linker error.
 
 struct UniqueFDTraits {
-  inline static std::mutex file_map_mutex;
-  inline static std::map<HANDLE, DirCacheEntry> file_map;
+  static std::mutex file_map_mutex;
+  static std::map<HANDLE, DirCacheEntry> file_map;
 
   static HANDLE InvalidValue() { return INVALID_HANDLE_VALUE; }
   static bool IsValid(HANDLE value) { return value != InvalidValue(); }