hwcomposer: fix parallel builds

libhybris-hwcomposerwindow.la was not built before eglplatform_hwcomposer.la thus the error.
this leaves only eglplatform_hwcomposer.la

Signed-off-by: groleo <adrian.m.negreanu@intel.com>
Merge pull request #95 from groleo/tz

hwcomposer: fix parallel builds