makepkg: restrict usage of errexit to user functions

It's expected that this will lead to unwanted behavior, and needs
widespread testing. It's desirable to commit this for a few reasons:

- there's no reason we can't do our own error checking for code that we
  write.
- it avoids the need for ||true hacks scattered about in the code.
- it makes us immune to upstream changes in exit codes (FS#28248)

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

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