actually - keep (path * stamp -> key) and (key -> path * stamp) history - we do not need to evict these. also fix incorrect file map view closure on debug info close

src/os/core/win32/os_core_win32.c

@@ -336,6 +336,11 @@ os_file_open(OS_AccessFlags flags, String8 path)
   {
     result.u64[0] = (U64)file;
   }
+  else
+  {
+    DWORD err = GetLastError();
+    (void)err;
+  }
   scratch_end(scratch);
   return result;
 }