[WIP] vim-patch:7.4.365

**vim-patch:7.4.365**

Problem:    Crash when using ":botright split" when there isn't much space.
Solution:   Add a check for the minimum width/height. (Yukihiro Nakadaira)

https://code.google.com/p/vim/source/detail?r=v7-4-365

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Again, there are some more patches for `window.c` to be included here. This will include 7.4.373 which we marked as `NA` but changes the scope of some variables. The others are 7.4.372 and 7.4.377.