Some vim plugin commands do not load

[Ben Rudolph]

Some plugins that load in regular vim do not load in macvim. I'm specifically having difficulty with "vim-do" and "YouCompleteMe". I'm having trouble even debugging why this would be the case. I've tried a bunch of different things including building from source. YouCompleteMe is especially puzzling because about half the commands are available while the other half are not.

Any insight into how to debug or why this would be would be much appreciated.

MacVim version:

```
➜ mvim --version
VIM - Vi IMproved 8.1 (2018 May 18, compiled Jun 11 2019 08:22:43)
macOS version
Included patches: 1-1517
Compiled by tra...@Traviss-Mac.local
Huge version with MacVim GUI. Features included (+) or not (-):
+acl +file_in_path +mouse_urxvt -tcl
+arabic +find_in_path +mouse_xterm +termguicolors
+autocmd +float +multi_byte +terminal
+autochdir +folding +multi_lang +terminfo
-autoservername -footer -mzscheme +termresponse
+balloon_eval +fork() +netbeans_intg +textobjects
+balloon_eval_term +fullscreen +num64 +textprop
+browse -gettext +odbeditor +timers
++builtin_terms -hangul_input +packages +title
+byte_offset +iconv +path_extra +toolbar
+channel +insert_expand +perl/dyn +transparency
+cindent +job +persistent_undo +user_commands
+clientserver +jumplist +postscript +vartabs
+clipboard +keymap +printer +vertsplit
+cmdline_compl +lambda +profile +virtualedit
+cmdline_hist +langmap +python/dyn +visual
+cmdline_info +libcall +python3/dyn +visualextra
+comments +linebreak +quickfix +viminfo
+conceal +lispindent +reltime +vreplace
+cryptv +listcmds +rightleft +wildignore
+cscope +localmap +ruby/dyn +wildmenu
+cursorbind +lua/dyn +scrollbind +windows
+cursorshape +menu +signs +writebackup
+dialog_con_gui +mksession +smartindent -X11
+diff +modify_fname -sound -xfontset
+digraphs +mouse +spell +xim
+dnd +mouseshape +startuptime -xpm
-ebcdic +mouse_dec +statusline -xsmp
+emacs_tags -mouse_gpm -sun_workshop -xterm_clipboard
+eval -mouse_jsbterm +syntax -xterm_save
+ex_extra +mouse_netterm +tag_binary
+extra_search +mouse_sgr -tag_old_static
-farsi -mouse_sysmouse -tag_any_white
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
defaults file: "$VIMRUNTIME/defaults.vim"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/Applications/MacVim.app/Contents/Resources/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MACVIM -Wall -Wno-unknown-pragmas -pipe -DMACOS_X -DMACOS_X_DARWIN -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib -L/usr/local/lib -o Vim -framework Cocoa -framework Carbon -lm -lncurses -liconv -framework AppKit -fstack-protector -L/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE
```