<NME> libigl
<BEF> ADDFILE
<MSG> Re-added libigl submodule

See https://libigl.github.io/rewritten-history/.

<DFF> @@ -0,0 +1,1 @@
+Subproject commit e699d257fe860d4fd82709835e72438bd0cd1533

Re-added libigl submodule