xbmc: add `python` to `DEPENDS`

xbmc: add `python` to `DEPENDS`

XBMC needs Python to be built properly [1][2]. Python is pulled in implicitly [3], so no error is seen. Make it explicit though to be safe.

[1] https://github.com/xbmc/xbmc/blob/e9e7990b428863b8f2daad4dc5fd2b0a320aa965/Makefile.in#L475
[2] http://cgit.openembedded.org/cgit.cgi/openembedded/tree/recipes/xbmc/xbmc/0006-Hardcode-python2.6-for-now.patch?id=0cc02ded7bd429208ccb0e0e0aa3e43aec8a4722
[3] http://cgit.openembedded.org/cgit.cgi/openembedded/tree/recipes/boost/boost-with-bjam.inc?id=d470cfde5bd1d4c9ab23a37d286456726711229f#n67

Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Signed-off-by: Khem Raj <raj.khem@gmail.com>