Configure GCC with --enable-initfini-array [BZ #27945]

Starting from GCC 12, the .init_array and .fini_array sections are enabled
unconditionally by

commit 13a39886940331149173b25d6ebde0850668d8b9
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jun 8 16:09:24 2021 -0700

    Always enable DT_INIT_ARRAY/DT_FINI_ARRAY on Linux

configure GCC with --enable-initfini-array to enable them when using GCC
release branches.

Fixes BZ #27945.