bump version

Release v2.4.2 (Closes: #54)

tag for official release: libsmbios 2.4.1

tagging package libsmbios version debian/2.4.1-1

Debian release 2.4.0-1

tag for official release: libsmbios 2.4.0

Update version in configure.ac to match reality

Drop RBU support

Ever since switching BIOS from legacy to UEFI in client the RBU support in
libsmbios has not worked properly.  The future direction for supporting
BIOS flash in Linux on client will not be through fwupd.

Signed-off-by: Mario Limonciello <[email protected]>

tag for official release: libsmbios 2.3.1

tag for official release: libsmbios 2.3.0