Prevent GNU linker synthetic LOAD map statements to propagate to dependencies.

Prevent GNU linker synthetic LOAD map statements to propagate to dependencies.

Never versions of GNU binutils LD generates next line into map files

  LOAD linker stubs

which is synthetic and does not match any file in filesystem.
It has to be excluded from the generated dependency files.

Signed-off-by: Pavel Pisa <ppisa@pikron.com>