package/netsniff-ng: allow to build with uclibc but w/o mausezahn

mausezahn can't be build with uclibc because uclibc does not provide
ceill() function, so it does not allow to build all netsniff-ng's
tools with uclibc.

Fix it by moving mausezahn under separate config option, which has own
dependencies and packages selection (libnet & libcli).

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
[Thomas:
 - use the allbutmausezahn and install_allbutmausezahn targets inside
   of enumerating all the tools in the .mk file
 - stick to a "config" instead of introducing a "menuconfig"]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>