meson.build: Bump the minimum GCC version to v10.4

Our minimum supported version of GCC used to be v7.4 since we still wanted to support NetBSD 9.x in the past: https://gitlab.com/qemu-project/qemu/-/issues/614 https://gitlab.com/qemu-project/qemu/-/commit/3830df5f83b9b52d949676 However, NetBSD 10 has already been released since two years ago (see https://www.netbsd.org/releases/formal-10/NetBSD-10.0.html), so according to our support policy, starting with QEMU v11.0, we don't have to take care of the previous major release of NetBSD anymore. Looking at the various distros that we take care of (see e.g. https://repology.org/project/gcc/versions), and the NetBSD 10.0 3rd party package information: https://cvsweb.netbsd.org/bsdweb.cgi/src/doc/3RDPARTY?rev=1.1905.2.14;content-type=text%2Fplain;only_with_tag=netbsd-10-0-RELEASE ... it seems like NetBSD 10 has the lowest version of GCC again, but at least it's GCC 10.4 now. Thus bump our GCC requirement to this version now. Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Acked-by: Fabiano Rosas <farosas@suse.de> Signed-off-by: Thomas Huth <thuth@redhat.com> Message-ID: <20260310155331.320066-1-thuth@redhat.com>