BaseTools: Fix the bug to collect source files per build rule family

when collect source files list we should also consider build rule
family. BuildRuleFamily may be set to the different one. It will
impact BuildRule and source files in INF file.

Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=780


Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>