backports: nuke support for kernels < 3.0

backports: nuke support for kernels < 3.0

mcgrof@drvbp1 ~/backports (git::master)$ time ./gentree.py --clean
/home/mcgrof/linux-next /home/mcgrof/build/next-20140409
Copy original source files ...
Apply patches ...
Modify Kconfig tree ...
Rewrite Makefiles and Kconfig files ...
Done!

real    1m30.186s
user    9m25.180s
sys     0m24.428s

mcgrof@drvbp1 ~/build/next-20140409 $ time ckmake --allyesconfig
1   3.0.101             [  OK  ]
2   3.1.10              [  OK  ]
3   3.2.54              [  OK  ]
4   3.3.8               [  OK  ]
5   3.4.79              [  OK  ]
6   3.5.7               [  OK  ]
7   3.6.11              [  OK  ]
8   3.7.10              [  OK  ]
9   3.8.13              [  OK  ]
10  3.9.11              [  OK  ]
11  3.10.29             [  OK  ]
12  3.11.10             [  OK  ]
13  3.12.10             [  OK  ]
14  3.13.2              [  OK  ]
15  3.14-rc1            [  OK  ]

real    26m54.859s
user    744m15.764s
sys     83m47.440s

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>