Bastien Nocera's RTL8723BS wifi github (hadess/rtl8723bs) has been merged into the kernel staging tree and as a result the compiling of the driver as an external module or running the driver on older kernels is no longer supported and the repository now only contains the history of the driver cleanup which is not available in the upstream-merged driver. As the final commit states:
The driver is available upstream now in the linux-next tree, in
the staging drivers section. All tests, bug reports should be
made to the linux-wireless mailing-list, using this upstream driver.
Consider the existence of this GitHub repository as historical
documentation. Patches that were shipped as part of this repository have
mostly been subsided and obsoleted by upstream kernel fixes.
Support for Bluetooth, and the firmware files are also in the process
of being made available upstream, and will be removed when that happens.
If all goes to plan it should appear in mainline kernel 4.12-rc1 whose merge window should open next week barring any last minute issues with the first builds appearing in early May.
I've consequently retired my script 'linuxium-install-rtl8723bs.sh' as we look forward to the upcoming mainline support.