Adding Address Space Layout Randomization support for SSH binaries in AIX

[AkankshaP15]

Adding Address Space Layout Randomization support for SSH binaries in AIX to enhance security against memory-based attacks. This feature is designed to improve security by loading shared memory objects at random addresses instead of fixed addresses.

[daztucker]

also, you placed it inside a configure test that's for a completely different purpose. Given that it's a linker flag, does it work with alternative compilers such as gcc or clang on those systems? Either way I think it should be its own stand-alone test, not inside AC_MSG_CHECKING([if compiler allows macro redefinitions]).