ld: write resolved path to included file to dependency-file

In ldfile_open_command_file_1() name written to the dependency files is
the name as specified passed to the "INCLUDE" directive.
This is before include-path processing so the tracked dependency
location is most likely wrong.

Instead track the opened file at the point where the resolved path is
actually available, in try_open().

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>