mp3blaster: pull pending upstream inclusion fix for ncurses-6.3
mp3blaster: pull pending upstream inclusion fix for ncurses-6.3

Without the fix build on ncurses-6.3 fails as:

    nmixer.cc:219:26: error: format not a string literal and no format arguments [-Werror=format-security]
      219 |                 mvwprintw(mixwin, my_y - 1, my_x, (char*)source);
          |                 ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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