Merge pull request #656 from decrispell/alt_pybind11

enable use of alternate pybind11

Former-commit-id: 7a54145cc8452b1024bb2657a3c799a9f7623aea

python/CMakeLists.txt

@@ -23,7 +23,8 @@ if(UNIX)
 endif()
 
 ## include pybind
-add_subdirectory(${PROJECT_SOURCE_DIR}/../external/nanogui/ext/pybind11 pybind11)
+set(PYBIND11_DIR ${PROJECT_SOURCE_DIR}/../external/nanogui/ext/pybind11 CACHE PATH "Path to pybind11")
+add_subdirectory(${PYBIND11_DIR} pybind11)
 
 ## include libigl
 option(LIBIGL_USE_STATIC_LIBRARY "Use LibIGL as static library" OFF)