Fix ISO C90 (#153465).

[Derek Atkins]

Log Message:
-----------
Fix ISO C90 (#153465).

	* src/engine/test/test-transaction-reversal.c:
	* src/engine/test-core/test-engine-stuff.c:
	  Fix for ISO C90.  Fixes #153465.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/engine/test:
        test-transaction-reversal.c
    gnucash/src/engine/test-core:
        test-engine-stuff.c