wm/fvwm: update to fvwm-2.7.0

This a bugfix release for the fvwm2 branch.

* Changes (local)
- GTK1+ support removed (already dropped upstream as of release 2.6.7)
- patches renamed to match target file
- linted

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Changes in stable release 2.7.0 (19-Oct-2022)

* Bug fixes:

- Fix handling of configure's --enable-mandoc/--enable-htmldoc
- Fix crash in FvwmPager when desk height or width is 0
- Added DoubleClick time to man page.
- Fix to FvwmIconMan to disable a SizeHint warning.
- Allow for reproducible builds.
- Increase the number of supported mouse buttons to 15.
- Tweaks to configure.ac

(vins)