There are a total of 5 shell scripts in the Neovim source tree.
All but runtime\macros\less.sh had warnings/errors when run through
Shellcheck (http://www.shellcheck.net/).
This commit fixes all warnings/errors and also changes the shebang to
"#!/bin/sh" when possible (this was not possible for vim-patch.sh
because it uses many bashisms).
The shellcheck errors that were fixed are:
SC2068: Double quote array expansions to avoid re-splitting elements.
SC2086: Double quote to prevent globbing and word splitting.
SC2124: Assigning an array to a string! Assign as array, or use *
instead of @ to concatenate
SC2155: Declare and assign separately to avoid masking return values.
