Update LINUX_INSTALL.md
Update LINUX_INSTALL.md

I find:  even though the wrapper.pyx changed, my computer (Raspberry PI) won't build wrapper.c, but use the existing builded  wrapper.c in /seabreeze/cseabreeze. The reason is that pip can't find Cython.
ap--/python-seabreeze,ap--/python-seabreeze,TobiasNils/python-seabreeze,ap--/python-seabreeze,TobiasNils/python-seabreeze,TobiasNils/python-seabreeze