[tools] add second gitignore to avoid checking in binary tools
[tools] add second gitignore to avoid checking in binary tools

Change-Id: I07977cc7fe2ae3f4f42fe9c2f925a1eb7e7dc0f0

minglun-tsai/lk,minglun-tsai/lk,travisg/lk,hollanderic/lkstuff,travisg/lk,nvll/lk,travisg/lk,nvll/lk,sndnvaps/lk,littlekernel/lk,littlekernel/lk,GCrean/lk,ErikCorryGoogle/lk,srodrig1/lk,GCrean/lk,srodrig1/lk,skabet/lk,minglun-tsai/lk,minglun-tsai/lk,ErikCorryGoogle/lk,sndnvaps/lk,skabet/lk,hollanderic/lkstuff,GCrean/lk,sndnvaps/lk,nvll/lk,srodrig1/lk,sndnvaps/lk,travisg/lk,nvll/lk,littlekernel/lk,skabet/lk,skabet/lk,srodrig1/lk,skabet/lk,ErikCorryGoogle/lk,hollanderic/lkstuff,ErikCorryGoogle/lk,littlekernel/lk,srodrig1/lk,sndnvaps/lk,nvll/lk,GCrean/lk,GCrean/lk,hollanderic/lkstuff