elf, ptxed: prepend sysroot to file names from file notes

When the --sysroot option is used, prepend the sysroot to file names from file
notes.

Change-Id: I4ab3b978b90233758ff546fad5c8fbc320a40c40
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
3 files changed