mail/mew: Update to 6.9
0974a3c0296f
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mail/mew: Update to 6.9

Take maintainership as there are already 3 successive maintainer timeout in the past.
Switch to DISTVERSION.
Set DISTVERSION to 6.9 and explicitly set DISTFILES. At first upstream released source archive as 'mew-6.9.tar.gz'. But issue that results in installation error is reported. So he fixed it and release new source archive as 'mew-6.9a.tar.gz'. And he said the latter is rerolled source archive of version 6.9.
Remove patch-no-native-compile as Mew works fine with native compilation now.
Install elisp and image files to EMACS_VERSION_SITE_LISPDIR.
Unconditionally install mew.ja.info as per section 5.17.4 of Porter's Handbook.
Pet portclippy.
Tidy up Makefile with portfmt.