- Drop conditionals for no longer supported versions of openSUSE
and stop passing no longer needed nor recognized options
with-package-name and with-package-origin to configure.
- Pass enable-dmabuf="yes" and enable-egl="yes" to configure, build
dmabuf and egl support, we already had the BuildRequires in
place, just not the needed options. Add explicit
pkgconfig(libva-wayland) BuildRequires, already pulled in, as
configure checks for it.
- Drop pkgconfig(libv4l2) BuildRequires: Currently not used.
- Stop exporting CXXFLAGS="-Wno-error", fixed in version 1.3.2.
- Do general spec modernization, replace gcc-c++ with generic
c++_compiler, also add explicit c_compiler BuildRequires.