Should now automatically detect it during Android build

The labels of a model are now cloned instead of using Mat::copyTo, because Mat::copyTo leads to a crash with the Python wrapper. I need to further investigate it.

Added a simple CMakeLists.txt to the facerec_samples, which are not included in the samples folder. Makes building these samples a lot easier.

Search keys for /proc/sysinfo updated.

Camera connect->disconnect->connect leads to sigsegv.
Apply properties method reimplemented.

This reverts commit 907a9101.

It is needed because of explicit STL include paths.
Otherwise some standard headers (like fenv.h) can not not be correctly found by the compiler.