vim-patch:8.2.3227: 'virtualedit' can only be set globally

Problem:    'virtualedit' can only be set globally.
Solution:   Make 'virtualedit' global-local. (Gary Johnson, closes vim/vim#8638)
53ba05b090

I changed some macros to unsigned integer literals to avoid compiler warnings.

src/nvim/buffer_defs.h

@@ -772,6 +772,8 @@ struct file_buffer {
   long b_p_ul;                  ///< 'undolevels' local value
   int b_p_udf;                  ///< 'undofile'
   char_u *b_p_lw;               ///< 'lispwords' local value
+  char_u *b_p_ve;               ///< 'virtualedit' local value
+  unsigned b_ve_flags;          ///< flags for 'virtualedit'
 
   // end of buffer options