- Update SPEC file:
      Remove usermerged macro and script: 
         1, currently, it blocks the building in SLE-15-SP4;
         2, plymouth already build with "without-system-root-install", 
         make all binary install to /usr/bin and /usr/sbin; which 
         fit for /user merge target.
         3, plymouth is not launched by user. and all system intergration
         point are called from /usr.
         4, So no change need to do, everything already works.
      Remove rm rhgb-client: 
         plymouth already build with "without-rhgb-compat-link", 
         rhgb doesn't generated from beginning.
      Remove "disable-libkms": 
         SUSE support kms and drm very well now, plymouth works 
         fine with them.
- Remove plymouth-correct-runtime-dir.patch: 
      Use upstream build param "with-runtimedir=/run" to instead.
- Change plymouth-dracut build arch to noarch: 
      It only contain a script.
  Change libply, libply-boot-client, libply-splash-core, 
  libply-splash-graphics group from Development/Libraries/C and
  C++ to System/Libraries:
      They are plymouth and plymouthd runtime library, which install
      together with plymouth.
- Resort rpm file list.

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