Apply checkhttpgzipdeflate.patch

http://sourceforge.net/p/nagiosplug/patches/349/

Hand-applied 4 hunks which were rejected due to new
extended-perfdata code.
Rename 'd' (decompress) option to 'z' (unzip)

The short option 'd' is already used for 'header-string'.  Choose
'z', as it is unused, and is commonly used as a zip/compress flag.
Fix silly typo introduced while hand-applying patch