support/scripts/apply-patches.sh: fix whitespace

The apply-patches.sh script was using a mix of tabs and spaces, and
some three-space indentation. Normalize everything to four-space
indentation.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>