.gitignore: add ignore filters for a built tree on linux
.gitignore: add ignore filters for a built tree on linux

Signed-off-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Signed-off-by: Chad Versace <c34c009102e60d77975598e1f414f8a701c22d0b@chad.versace.us>

yinquan529/waffle-gl-waffle,yinquan529/waffle-gl-waffle,evelikov/waffle,waffle-gl/waffle,dcbaker/waffle,dcbaker/waffle,fjhenigman/waffle,fjhenigman/waffle,yinquan529/waffle-gl-waffle,janesma/waffle,waffle-gl/waffle,waffle-gl/waffle,maurossi/waffle,evelikov/waffle,maurossi/waffle,chadversary/waffle,maurossi/waffle,evelikov/waffle,chadversary/waffle,janesma/waffle,fjhenigman/waffle,waffle-gl/waffle,chadversary/waffle,janesma/waffle,dcbaker/waffle