elfutils: Fix debugedit failure in grub

elfutils: Fix debugedit failure in grub

We've seeing occasional debugedit failures in grub during do_package
which in turn are coming from section alignment failures from libelf.
The failures occur when gold is used to link grub instead of ld.bfd.

"readelf -e uhci.module" shows:

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
  [12] .note.GNU-stack   PROGBITS        00000000 0010ce 000000 00      0   0  1

in a good build and:

Section Headers:
  [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
  [24] .note.GNU-stack   PROGBITS        00000000 009180 000000 00      0   0  0

in a bad build. The problem is the "Al" (alignment) change from 1 to 0.
If its 0, debugedit complains.

As far as I can tell, the alignment of a zero length section is not
an issue and the check in libelf should check the section size and only
give alignment errors if there is some data to align.

(From OE-Core rev: b34447fa5223b4e0be49594aaf0254defd69bbd1)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>