Merge branch 'maint'
Added CMake variables to customize builds to match Debian package configurations
uhd: switch the reusable barrier to condition variables
This allows the converter threads in a multi-threaded streamer to wait quietly.In addition, the use of two barriers in the packet handlers was reduced to one,by adding a simple exit barrier inside the reusable barrier's wait method.
uhd: increment UHD_VERSION_ABI_STRING "3.6.0-0"
Added tune args to tune request.Thefore the API of the master branch does not match 3.5.* release,by this system, the compat string should be the unrelease 3.6 - w/ compat -0.The -0 may increase w/ future ABI/API changes before 3.6 release.
Merge branch 'next'
Merge branch 'fhs_work'
uhd: added args member to tune_request object
Merge branch 'maint34' into maint
uhd: make stream cmd enums easier on SWIG
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