cmake/LinuxPackaging.cmake: manually exclude each dir for CentOS 7 RPM creation
cmake/LinuxPackaging.cmake: manually exclude each dir for CentOS 7 RPM creation

Seems that using CPACK_RPM_EXCLUDE_FROM_AUTO_FILELIST works, but it's
required that each directory be added, even though it's parent
has already been added.

Signed-off-by: Alexandru Ardelean <685557f6b7c225d86b536740313ed51b24843a58@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio