Update abcm2ps to rev 9 via SR 746544
    
    https://build.opensuse.org/request/show/746544
    by user dimstar_suse
    - Update compiler_flags.patch
    
    - Update to 8.14.6:
      * bad voice combine '3' when 3 voices and unison
      * don't separate the accents from the notes by tuplets
      * clash of tuplet numbers with accents
      * bad time signature when C or C| and more value(s)
      * warnings from clang static analysis
      * bad music font selection when not defined by 'url(..)'
      * bad vertical offset of "%%multicol new" when W: and %%begintext
      * bad handling of fonts
      * Add option flatbeamgracing that applies flat beams to grace notes only
      * put the upper tuplets a bit closer to the notes