maintainer-feedback requested: [Bug 231819] databases/qt5-sqldrivers-mysql: fix build when base GCC is present

[bugzilla-noreply at freebsd.org]

Bugzilla Automation <bugzilla at FreeBSD.org> has asked kde at FreeBSD.org for
maintainer-feedback:
Bug 231819: databases/qt5-sqldrivers-mysql: fix build when base GCC is present
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231819



--- Description ---
This patch adds USES=compiler:c++17-lang to devel/qt5/Makefile.sqldrivers,
which is included in qt5-sqldrivers-* ports, so it also fixes build of other
ports.

Tested on powerpc64 and amd64.

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