vim-patch:7.4.234

Problem:  Can't get the command that was used to start Vim.

Solution: Add v:progpath. (Viktor Kojouharov)

https://code.google.com/p/vim/source/detail?r=d2286df8719d6e99c743e3bf6ac14d1f9debc84d

src/eval.c

@@ -389,6 +389,7 @@ static struct vimvar {
   {VV_NAME("hlsearch",         VAR_NUMBER), 0},
   {VV_NAME("oldfiles",         VAR_LIST), 0},
   {VV_NAME("windowid",         VAR_NUMBER), VV_RO},
+  {VV_NAME("progpath",         VAR_STRING), VV_RO},
   {VV_NAME("job_data",         VAR_LIST), 0}
 };