[CMake] Use default .so extension for python bindings + remove useless lines

src/CMakeLists.txt

@@ -64,10 +64,7 @@ IF (UNIX )
     ADD_HEADER_GROUP(HEADERS)  
     ADD_SOURCE_GROUP(${PROJECT_NAME}_SOURCES)  
 
-    # Install target libpinocchio.so
-    INSTALL(FILES
-      "${CMAKE_BINARY_DIR}/src/lib${PROJECT_NAME}.so"
-      DESTINATION ${CMAKE_INSTALL_LIBDIR})
+    INSTALL(TARGETS ${PROJECT_NAME} DESTINATION lib)
 ENDIF ( )
 
 # ----------------------------------------------------
@@ -89,6 +86,12 @@ IF(EIGENPY_FOUND)
     PKG_CONFIG_USE_DEPENDENCY(${PYWRAP} lua5.1)
   ENDIF(LUA5_1_FOUND)
   TARGET_LINK_LIBRARIES(${PYWRAP} ${Boost_LIBRARIES} ${PROJECT_NAME})
+
+  IF(APPLE)
+    # We need to change the extension for python bindings
+    SET_TARGET_PROPERTIES(${PYWRAP} PROPERTIES SUFFIX ".so")
+  ENDIF(APPLE)
+
   SET_TARGET_PROPERTIES(${PYWRAP} PROPERTIES
     LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib/python/${PROJECT_NAME}")
   IF(URDFDOM_FOUND)