Fix ncl build with -Werror=format-security

The attached patch fixes building ncl 6.1.2 with
-Werror=format-security, which is now standard in Fedora. Note that
replacing many of the fprintf()s with fputs() (and sprintf with strncpy)
would be more efficient, though probably not an issue for this code.

To understand why it is important to fix this, please see
https://fedoraproject.org/wiki/Format-Security-FAQ page.

-- 
Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
3380 Mitchell Lane                  orion@cora.nwra.com
Boulder, CO 80301              http://www.cora.nwra.com

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