dev-qt/qtwebengine: replace -g3+ for -g unless custom-cflags (qt6)

On second thought let's do this, but keep a warning that mentions
USE=custom-cflags given users may not be used to -g* getting
replaced and then lacking the symbols they were expecting.

Not going to keep disk space / memory usage updated for -g as
estimates would likely be all over the place and consider that
the warning is sufficient there.

Not using a full replace-flags '-g*' -g to allow e.g. a package.env
that adds -g0/-g1 at the end to still work while disregaring the
warning without implementing extra logic.

Note that have not retried -g to be sure it is fine, albeit pretty
sure it was fine last time tried. Worst case could replace by -g1,
or drop flags-respecting-patches and request debugging symbols to
gn instead (selectively forces -g1 even if asked for more).

Closes: https://bugs.gentoo.org/914475
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

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