The minimal sample doesn't have an implicit deployment target set, while
the library does through CMakeLists.txt in root. This can result in iOS
link errors when not explicitly setting CMAKE_OSX_DEPLOYMENT_TARGET as
the sample will then use a target OS with an architecture that may not
be present in the library with its current target OS version.
Fix by copying the part setting CMAKE_OSX_DEPLOYMENT_TARGET in the
library to the minimal sample as well. Both parts should be kept in sync
but that still seemed preferable to additionally polluting an example
file for CMake usage with a dependency by introducing a common include
file.
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