gnucash maint: Fix some abs() errors from new clang and gcc versions.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/61021c46 (commit)
	from  https://github.com/Gnucash/gnucash/commit/405a26b6 (commit)



commit 61021c46208e4ff70b740a07c3c3258889325250
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Apr 28 09:41:05 2015 -0700

    Fix some abs() errors from new clang and gcc versions.



Summary of changes:
 src/gnome-utils/gnc-dense-cal.c    | 2 +-
 src/import-export/import-backend.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)