[libomp][AIX] Use SO version "1" for AIX libomp (#111384)

For `libomp` on AIX, we build shared object `libomp.so` first and then
archive it into libomp.a. This patch changes to use SO version `1` and
name the shared object `libomp.so.1` so that it is consistent with the
naming of other shared objects in AIX libraries, e.g., `libc++.so.1` in
`libc++.a`. With this change, the change made in commit
bde51d9b0d473447ea12fb14924f14ea167eec85 to ensure only `libomp.a` is
published on AIX is no longer necessary and is removed.

GitOrigin-RevId: c62e61acb428bb46ad834f8288b0c6f8c2ea8d31
1 file changed