Neovim: Fix various bits in ':CheckHealth', including detection of Python.

Issue found by tb@ when the ${LOCALBASE}/bin/python symlink is not existing.
Upstream fixed a couple of other bugs in the same PR. Thanks all.

OK tb@

editors/neovim/Makefile

@@ -1,10 +1,11 @@
-# $OpenBSD: Makefile,v 1.1.1.1 2017/05/02 20:58:42 edd Exp $
+# $OpenBSD: Makefile,v 1.2 2017/05/12 09:56:33 edd Exp $
 
 COMMENT =	a continuation and extension of Vim
 
 GH_ACCOUNT =	neovim
 GH_PROJECT =	neovim
 GH_TAGNAME =	v0.2.0
+REVISION =	0
 
 CATEGORIES =	editors devel
 HOMEPAGE =	http://neovim.org

editors/neovim/patches/patch-runtime_autoload_health_provider_vim

@@ -0,0 +1,69 @@
+$OpenBSD: patch-runtime_autoload_health_provider_vim,v 1.1 2017/05/12 09:56:34 edd Exp $
+
+https://github.com/neovim/neovim/pull/6721
+
+Index: runtime/autoload/health/provider.vim
+--- runtime/autoload/health/provider.vim.orig
++++ runtime/autoload/health/provider.vim
+@@ -38,6 +38,16 @@ function! s:system_handler(jobid, data, event) dict ab
+   endif
+ endfunction
+ 
++" Attempts to construct a shell command from an args list.
++" Only for display, to help users debug a failed command.
++function! s:shellify(cmd) abort
++  if type(a:cmd) != type([])
++    return a:cmd
++  endif
++  return join(map(copy(a:cmd),
++    \'v:val =~# ''\m[\-.a-zA-Z_/]'' ? shellescape(v:val) : v:val'), ' ')
++endfunction
++
+ " Run a system command and timeout after 30 seconds.
+ function! s:system(cmd, ...) abort
+   let stdin = a:0 ? a:1 : ''
+@@ -54,8 +64,7 @@ function! s:system(cmd, ...) abort
+   let jobid = jobstart(a:cmd, opts)
+ 
+   if jobid < 1
+-    call health#report_error(printf('Command error %d: %s', jobid,
+-          \ type(a:cmd) == type([]) ? join(a:cmd) : a:cmd))
++    call health#report_error(printf('Command error (job=%d): %s', jobid, s:shellify(a:cmd)))
+     let s:shell_error = 1
+     return opts.output
+   endif
+@@ -66,13 +75,11 @@ function! s:system(cmd, ...) abort
+ 
+   let res = jobwait([jobid], 30000)
+   if res[0] == -1
+-    call health#report_error(printf('Command timed out: %s',
+-          \ type(a:cmd) == type([]) ? join(a:cmd) : a:cmd))
++    call health#report_error(printf('Command timed out: %s', s:shellify(a:cmd)))
+     call jobstop(jobid)
+   elseif s:shell_error != 0 && !ignore_error
+-    call health#report_error(printf('Command error (%d) %s: %s', jobid,
+-          \ type(a:cmd) == type([]) ? join(a:cmd) : a:cmd,
+-          \ opts.output))
++    call health#report_error(printf("Command error (job=%d): %s\nOutput: %s", jobid,
++          \ s:shellify(a:cmd), opts.output))
+   endif
+ 
+   return opts.output
+@@ -157,7 +164,7 @@ function! s:version_info(python) abort
+         \ ]))
+ 
+   if empty(python_version)
+-    let python_version = 'unable to parse python response'
++    let python_version = 'unable to parse '.a:python.' response'
+   endif
+ 
+   let nvim_path = s:trim(s:system([
+@@ -176,7 +183,7 @@ function! s:version_info(python) abort
+   endfunction
+ 
+   " Try to get neovim.VERSION (added in 0.1.11dev).
+-  let nvim_version = s:system(['python', '-c',
++  let nvim_version = s:system([a:python, '-c',
+         \ 'from neovim import VERSION as v; '.
+         \ 'print("{}.{}.{}{}".format(v.major, v.minor, v.patch, v.prerelease))'],
+         \ '', 1, 1)

editors/neovim/patches/patch-runtime_autoload_health_vim

@@ -0,0 +1,15 @@
+$OpenBSD: patch-runtime_autoload_health_vim,v 1.1 2017/05/12 09:56:34 edd Exp $
+
+https://github.com/neovim/neovim/pull/6721
+
+Index: runtime/autoload/health.vim
+--- runtime/autoload/health.vim.orig
++++ runtime/autoload/health.vim
+@@ -66,6 +66,7 @@ function! health#check(plugin_names) abort
+   " needed for plasticboy/vim-markdown, because it uses fdm=expr
+   normal! zR
+   setlocal nomodified
++  setlocal bufhidden=hide
+   redraw|echo ''
+ endfunction
+