For AIX, modify the perl.exp path in ccdlflags earlier in Makefile.SH

The config.sh value for ccdlflags includes the path to the *installed*
copy of the file perl.exp

While building, that file doesn't exist (or worse, is incompatible) so in
the Makefile we need CCDLFLAGS to point to the local copy. Previously the
Makefile had CCDLFLAGS first set to the value with the installed path, and
then set it again to the local path "for building Perl itself". However,
the Makefile is *only* used for building Perl itself (not installed
extensions), hence we never need the first value. Hence move the sed logic
for the change earlier, write out the first declaration of CCDLFLAGS with
the "local" value, and eliminate the second declaration.

The sed logic was added in July 1999 by commit 5f9d9a1727238445:
    AIX magic: ccdlflags needs to be different for
    Perl itself and for extra-core extensions
    (as used by ExtUtilss::embed::ldopts).
    Based on the problems described in
    To: perl5-porters@perl.org
    Subject: [ID 19990722.002] Perl 5.00503 and AIX 4.1.5; perl.exp; build errors. Also Imagemagick...
    Reply-To: m.w.ellwood@rl.ac.uk
    Message-Id: <Pine.A41.3.96.990722141209.72660V-100000@unixfe.rl.ac.uk>

It probably should have always been done the way this commit now does it.

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