xbmc: new package

XBMC is an award-winning free and open source (GPL) software media player and
entertainment hub for digital media.
This package was originally found at : https://github.com/huceke/buildroot-rbp
By gimli <ebsi4711@gmail.com>

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Cc: gimli <ebsi4711@gmail.com>
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Changes v6 -> v7:
  - Fix various capitalization issue (Thomas De Schampheleire)
  - Changes depends on !uclibc to a depends on glibc (Thomas De Schampheleire)
  - Remove TIFF being selected twice (Jerzy Grzegorek)
Changes v5 -> v6:
  - Fix missing depends on OpenGL (Yann E. Morin)
  - Remove LIBCEC_RBP Config option (Yann E. Morin)
  - Fix dependency that were, in the end, not optionnal (Martin Bark)
  - Fix OpenGL check (Martin Bark)
  - Uses BR2_HOST_NEEDS_JAVA (Martin Bark)
Changes v4 -> v5:
  - Remove MAKE1, seems to work fine with parallel build.
Changes v3 -> v4:
  - Rework init script
  - Add systemd startup service
Changes v2 -> v3:
  - Fix indent
  - Change librtmp to rtmpdump
Changes v1 -> v2:
  - Fix header (Yann E. Morin)
  - Fix comment on toolchain option (Peter Korsgaard)