Enable Embree module.

Former-commit-id: 91c393de0113a8fcdb7960b3f9af0c02141c3a47

.appveyor.yml

@@ -15,7 +15,7 @@ build_script:
   - cd c:\projects\libigl\tutorial
   - mkdir build
   - cd build
-  - cmake -D "LIBIGL_USE_STATIC_LIBRARY=ON" -D "LIBIGL_WITH_ANTTWEAKBAR=OFF" -D "LIBIGL_WITH_EMBREE=OFF" -G "Visual Studio 14 2015 Win64" ../
+  - cmake -D "LIBIGL_USE_STATIC_LIBRARY=ON" -D "LIBIGL_WITH_ANTTWEAKBAR=OFF" -G "Visual Studio 14 2015 Win64" ../
 #  - cmake -G "Visual Studio 14 2015 Win64" ../
   - set MSBuildLogger="C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
 #  - set MSBuildOptions=/v:m /p:Configuration=Release /logger:%MSBuildLogger%

.travis.yml

@@ -63,5 +63,5 @@ matrix:
         - cd tutorial
         - mkdir build
         - cd build
-        - cmake -DLIBIGL_USE_STATIC_LIBRARY=ON -DLIBIGL_WITH_EMBREE=OFF ../
+        - cmake -DLIBIGL_USE_STATIC_LIBRARY=ON ../
         - make -j 2