cmake: make required maa version 0.2.6+

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

CMakeLists.txt

 find_package (Threads REQUIRED)
 find_package (PkgConfig REQUIRED)
 # force the libmaa version to be the required version
-pkg_check_modules (MAA REQUIRED maa=0.2.6)
+pkg_check_modules (MAA REQUIRED maa>=0.2.6)
 message (INFO " found libmaa version: ${MAA_VERSION}")
 
 set (CMAKE_SWIG_FLAGS "")