vimrc.android: Set nomodeline

For security reasons.

Modeline functionality has been a constant source of security issues.

Latest:
https://github.com/numirias/security/blob/master/doc/2019-06-04_ace-vim-neovim.md

Signed-off-by: Felix <google@ix5.org>
Change-Id: Id6e680e7d2b29841717e63ee7668434a9d8466c4
diff --git a/vimrc.android b/vimrc.android
index 3c95fdb..2f74488 100644
--- a/vimrc.android
+++ b/vimrc.android
@@ -15,6 +15,9 @@
 " allow backspacing over everything in insert mode
 set backspace=indent,eol,start
 
+" Disable modeline parsing for security reasons
+set nomodeline
+
 " swap directories
 set directory=.,/data/local/tmp,/tmp