maintainer-feedback requested: [Bug 244521] www/firefox, mail/thunderbird, and other gecko software: require py-sqlite3, but uses py27-sqlite3 instead py37-sqlite3

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Bugzilla Automation <bugzilla at FreeBSD.org> has asked freebsd-gecko mailing list
<gecko at FreeBSD.org> for maintainer-feedback:
Bug 244521: www/firefox, mail/thunderbird, and other gecko software: require
py-sqlite3, but uses py27-sqlite3 instead py37-sqlite3
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244521



--- Description ---
Mk/bsd.gecko.mk have:
USES+=		python:2.7,build

www/firefox/Makefile and mail/thunderbird/Makefile have:
BUILD_DEPENDS=
${PYTHON_PKGNAMEPREFIX}sqlite3>0:databases/py-sqlite3@${PY_FLAVOR}

But it uses python2 FLAVOUR for this dependency instead python3.

Dirty hack:
-${PYTHON_PKGNAMEPREFIX}sqlite3>0:databases/py-sqlite3@${PY_FLAVOR} \
+py37-sqlite3>0:databases/py-sqlite3 at py37 \

How to set FLAVOR in default python correctly?