package/c-icap: fix bzip2 configure option

The configure option controlling bzip2 support got its current name in
2012 with its initial commit:

https://sourceforge.net/p/c-icap/code/890/#diff-2



This patch fixes the configure warning:

configure: WARNING: unrecognized options: [...] --without-bzip2

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>