monkey: switch to cmake package

monkey: switch to cmake package

Since version 1.6.x the configure script is a wrapper around cmake. Use
cmake directly since we want to make sure that cmake is available.

monkey no longer provides the libmonkey.so shared library. Remove the
BR2_PACKAGE_MONKEY_SHARED option.

Fixes:
http://autobuild.buildroot.net/results/b07/b077720c16857b752f4f38b73619a6a62862f35f/
http://autobuild.buildroot.net/results/799/799bcbd332f254fbf3d3547e5e52ac9463d58bcc/
http://autobuild.buildroot.net/results/3b0/3b095ca77a900af724fbc79d9cc20cbb9931fe15/

Cc: Morgan Delestre <m.delestre@sinters.fr>
Cc: David Pierret <david.pierret@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>