Add more warnings to autogen.

[Derek Atkins]

Log Message:
-----------
Add more warnings to autogen.

	* src/macros/autogen.sh: Add MORE warnings around gettext because
	  some users STILL don't "get it".

Tags:
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gnucash-1-8-branch

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/macros:
        autogen.sh