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Autoconf states that AC_HELP_STRING is obsolete, and that new programs should use AS_HELP_STRING. We also had instances of not properly quoting the macro usage, and not relying on autoconf's word-wrapping abilities to avoid long lines. I validated that this commit has no impact to the generated configure file. * configure.ac (AC_ARG_WITH, AC_ARG_ENABLE): Autoconf recommends the use of AS_HELP_STRING. Also, use proper quoting and wrap long lines. * m4/virt-apparmor.m4 (LIBVIRT_CHECK_APPARMOR): Likewise. * m4/virt-selinux.m4 (LIBVIRT_CHECK_SELINUX): Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>