It shows warning when apply configure.ac-automake-error.patch:
| WARNING: mtree-1.0.3+gitAUTOINC+4f3e901aea-r0 do_patch:
| ...
| Details:
| Applying patch configure.ac-automake-error.patch
| patching file configure.ac
| Hunk #1 succeeded at 4 with fuzz 2 (offset -2 lines).
Update context of configure.ac-automake-error.patch to sync with current
mtree source codes.
Signed-off-by: Kai Kang <kai.kang@windriver.com>