turn off CORK by default (GMP not easy on windows

Former-commit-id: f2c209fe95a427a456c945fa27810c2081e99c90

optional/CMakeLists.txt

@@ -22,7 +22,7 @@ option(LIBIGL_WITH_BBW              "Use BBW"            ON)
 find_package(CGAL QUIET)
 option(LIBIGL_WITH_CGAL             "Use CGAL"           "${CGAL_FOUND}")
 option(LIBIGL_WITH_COMISO           "Use CoMiso"         ON)
-option(LIBIGL_WITH_CORK             "Use Cork"           ON)
+option(LIBIGL_WITH_CORK             "Use Cork"           OFF)
 option(LIBIGL_WITH_EMBREE           "Use Embree"         ON)
 option(LIBIGL_WITH_LIM              "Use LIM"            ON)
 find_package(MATLAB QUIET)

tutorial/CMakeLists.txt

@@ -11,7 +11,7 @@ option(LIBIGL_WITH_BBW              "Use BBW"            ON)
 find_package(CGAL QUIET)
 option(LIBIGL_WITH_CGAL             "Use CGAL"           "${CGAL_FOUND}")
 option(LIBIGL_WITH_COMISO           "Use CoMiso"         ON)
-option(LIBIGL_WITH_CORK             "Use CORK"           ON)
+option(LIBIGL_WITH_CORK             "Use CORK"           OFF)
 option(LIBIGL_WITH_EMBREE           "Use Embree"         ON)
 option(LIBIGL_WITH_LIM              "Use LIM"            ON)
 find_package(MATLAB QUIET)