Update python3-blivetgui from 2.3.0 to 2.4.2
* drop patches that there are not needed any more
* not set var `B` that out of source tree build is supported
* inherit setuptools3 rather than setuptools3_legacy
Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
