uhd: make active variant boost-pythonXY just for uhd release

science/uhd/Portfile

@@ -367,7 +367,12 @@ if {${subport} ne "uhd-39lts"} {
             -DPYTHON_LIBRARY=${frameworks_dir}/Python.framework/Versions/${PythonVersionWithDot}/Python \
             -DUHD_PYTHON_DIR=${frameworks_dir}/Python.framework/Versions/${PythonVersionWithDot}/lib/python${PythonVersionWithDot}/site-packages
 
-        require_active_variants boost python${PythonVersionNoDot}
+        # 'uhd' requires boost-python to be the correct version, not
+        # 'uhd-devel' or 'uhd-39lts'; remove this once the release has
+        # fully moved to pybind11.
+        if {${subport} eq "uhd"} {
+            require_active_variants boost python${PythonVersionNoDot}
+        }
     }
 
     if {![variant_isset python_api]} {