Bug fix for running perception on personal PC (#3241)

* Fix a bug in recover_gcc.sh and perception document

docs/howto/how_to_run_perception_module_on_your_local_computer.md

@@ -28,6 +28,7 @@ ln -s /usr/bin/cc /usr/bin/cc1
 chmod +x ./NVIDIA-Linux-x86_64-375.39.run
 ./NVIDIA-Linux-x86_64-375.39.run --no-opengl-files -a -s
 source /apollo/scripts/recover_gcc.sh
+rm /usr/bin/cc1
 ```
 
 5. Commit a new docker image (in host):

scripts/recover_gcc.sh

@@ -5,5 +5,5 @@ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 50
 sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 50
 sudo update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-4.8 60
 sudo update-alternatives --set cc /usr/bin/gcc
-sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++4.8 60
+sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++-4.8 60
 sudo update-alternatives --set c++ /usr/bin/g++