Fix another slib3 issue.

[Derek Atkins]

Log Message:
-----------
Fix another slib3 issue.

	* src/engine/iso-currencies-to-c: don't automatically try to
	  (require 'format), so gnucash will build on an slib-3 system.

Tags:
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gnucash-1-8-branch

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/engine:
        iso-currencies-to-c