mythes: add 1.2.4 patches and rewire PATCH_FILES

Commit a3815d2648 dropped the PATCH_FILES references on the assumption
that mythes 1.2.4 builds cleanly from the upstream tarball. It does not:
confi

mythes: add 1.2.4 patches and rewire PATCH_FILES

Commit a3815d2648 dropped the PATCH_FILES references on the assumption
that mythes 1.2.4 builds cleanly from the upstream tarball. It does not:
configure unconditionally adds the example program to all-am, and
example.cxx includes <hunspell.hxx>, which is not available when the
bundled mythes is built:

example.cxx:7:10: fatal error: 'hunspell.hxx' file not found

Add the three 1.2.0 patches ported to 1.2.4 (disable the example
program, dmake makefile.mk for the Windows build, th_gen_idx.pl -o
output handling) and reference them from makefile.mk again. All three
verified to apply cleanly with the tg_ext.mk patch -p2 convention
against the upstream tarball.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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