Remove USE_CR and tag_fgets. #808

These features are only used by legacy Mac OS.
vim-patch:7.4.292  #754

Problem:    Searching for "a" does not match accented "a" with new regexp
            engine, does match with old engine. (David Bürgin)
            "ca" does not match "ca" with accented "a" with either engine.
Solution:   Change the old engine, check for following composing character
            also for single-byte patterns.

https://code.google.com/p/vim/source/detail?r=60cdaa05a6ad31cef55eb6b3dc1f57ecac6fcf79
vim-patch:7.4.290  #753

Problem:    A non-greedy match followed by a branch is too greedy. (Ingo
            Karkat)
Solution:   Add NFA_MATCH when it is already in the state list if the position
            differs.

https://code.google.com/p/vim/source/detail?r=b871734bf54ea185dbd2cc759d86dbfbe21cde26