These changes make KernelSU work on kernel4.4 [link](https://github.com/F-19-F/android_kernel_oneplus_msm8998). LINUX_VERSION_CODE macro changes have been vertied on 4.4 4.9 4.14. For kernel 4.4,just pick two commits * [introduce KernelSU](2993524f2f) * [allow init exec ksud under nosuid](3df9df42a6)