message: devtools: Add xkb version to symbol-check
  xkb versions symbols (using the prefix `V`), as this library is used by
  bitcoin-qt, add it to the valid versions in `symbol-check.py`.
diff: @@ -42,7 +42,8 @@ import pixie
  MAX_VERSIONS = {
  'GCC': (4,8,0),
  'GLIBC': (2,17),
  -'LIBATOMIC': (1,0)
  +'LIBATOMIC': (1,0),
  +'V': (0,5,0), # xkb (bitcoin-qt only)
  }
  # See here for a description of _IO_stdin_used:
  # https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634261#109
  