AIX: Fix support for editing XCOFF binary inside an archive

When AIX stores a `.so` inside a `.a` archive, the loader section is
aligned to maximum of the text and data alignment.  In commit 98013ad1ca
(cmXCOFF: Add support for editing binary inside an archive, 2024-07-01)
we only accounted for the data alignment.

Issue: #26275
1 file changed