variablize strip command and add --keep-file-symbols

We need to keep the file symbols around for add-patches-section
and link-vmlinux-syms to resolve ambigous symbols in vmlinux.

Signed-off-by: Seth Jennings <sjenning@redhat.com>
retain source tree directory structure with objects

The source tree directory structure should be maintained
in the TEMPDIR while building the hotpatch module so that
changed objects in different directories with the same
name don't collide during the build process.

Signed-off-by: Seth Jennings <sjenning@redhat.com>
Merge pull request #13 from spartacus06/fixes

Fixes