[unreachable_subsetting] should not flag characters part of Google Fonts Latin core

[mitradranirban]

Observed behaviour

The check says
The following codepoints supported by the font are not covered by any subsets defined in the font
U+02D8 BREVE: try adding one of: yi, canadian-aboriginal
U+02D9 DOT ABOVE: try adding one of: yi, canadian-aboriginal
U+02DB OGONEK: try adding one of: yi, canadian-aboriginal
U+0302 COMBINING CIRCUMFLEX ACCENT: try adding one of: tifinagh, math, cherokee, coptic
U+0306 COMBINING BREVE: try adding one of: tifinagh, old-permic
U+0307 COMBINING DOT ABOVE: try adding one of: hebrew, old-permic, math, todhri, canadian-aboriginal, tai-le, duployan, coptic, malayalam, syriac, tifinagh
U+030A COMBINING RING ABOVE: try adding one of: duployan, syriac
U+030B COMBINING DOUBLE ACUTE ACCENT: try adding one of: osage, cherokee
U+030C COMBINING CARON: try adding one of: cherokee, tai-le
U+0326 COMBINING COMMA BELOW: try adding math
U+0327 COMBINING CEDILLA: try adding math
U+0328 COMBINING OGONEK: not included in any glyphset definition
U+0331 COMBINING MACRON BELOW: try adding one of: caucasian-albanian, sunuwar, syriac, gothic, thai, tifinagh, cherokee

Or you can add the above codepoints to one of the subsets supported by the font: devanagari, latin, latin-ext

Expected behaviour

As these charcters are part of GF Latin Core they should not be flagged

Resources and steps needed to reproduce

font Samaano https://github.com/mitradranirban/samaano-fonts
FontBakery version 0.12.10
OS Ubuntu 22.04
Python version, 3.10.12