[RFC] vim-patch: Mark patches as NA.

 * https://code.google.com/p/vim/source/detail?r=v7-4-548 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-544 deals with compiler warnings for unused variables.
 * https://code.google.com/p/vim/source/detail?r=v7-4-540 adds a FEAT `#ifdef`
 * https://code.google.com/p/vim/source/detail?r=v7-4-534 is about build warnings in if_ruby.
 * https://code.google.com/p/vim/source/detail?r=v7-4-523 deals with clipboard/X11.
 * https://code.google.com/p/vim/source/detail?r=v7-4-512 modifies removed Windows/VMS files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-511 is about function prototype generation in if_ruby.
 * https://code.google.com/p/vim/source/detail?r=v7-4-510 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-507 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-506 modifies removed file `os_mswin.c`
 * https://code.google.com/p/vim/source/detail?r=v7-4-505 modifies removed file `os_win32.c`
 * https://code.google.com/p/vim/source/detail?r=v7-4-504 modifies Windows installer
 * https://code.google.com/p/vim/source/detail?r=v7-4-501 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-498 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-496 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-495 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-484 adds a cast to fix a compiler warning.
 * https://code.google.com/p/vim/source/detail?r=v7-4-459 modifies removed Windows files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-448 modifies removed `gui_w32.c` file.
 * https://code.google.com/p/vim/source/detail?r=v7-4-385 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-255 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-254 modifies build files.
 * https://code.google.com/p/vim/source/detail?r=v7-4-246 modifies build files.