Disable Embree build by default.

Former-commit-id: 28d973f17397b361552c8e3a66f3315bd8a573bd

shared/cmake/libigl.cmake

@@ -6,7 +6,7 @@ option(LIBIGL_WITH_ANTTWEAKBAR      "Use AntTweakBar"    OFF)
 option(LIBIGL_WITH_CGAL             "Use CGAL"           ON)
 option(LIBIGL_WITH_COMISO           "Use CoMiso"         ON)
 option(LIBIGL_WITH_CORK             "Use Cork"           OFF)
-option(LIBIGL_WITH_EMBREE           "Use Embree"         ON)
+option(LIBIGL_WITH_EMBREE           "Use Embree"         OFF)
 option(LIBIGL_WITH_LIM              "Use LIM"            ON)
 option(LIBIGL_WITH_MATLAB           "Use Matlab"         ON)
 option(LIBIGL_WITH_MOSEK            "Use MOSEK"          ON)