build: Use kebab-case library names in install tree

fairmq/plugins/PMIx/CMakeLists.txt

@@ -18,8 +18,7 @@ target_link_libraries(${plugin} PUBLIC FairMQ PMIx::libpmix)
 target_include_directories(${plugin} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 set_target_properties(${plugin} PROPERTIES
   CXX_VISIBILITY_PRESET hidden
-  VERSION ${PROJECT_VERSION}
-  SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}"
+  OUTPUT_NAME "${PROJECT_NAME_LOWER}-plugin-pmix"
 )
 
 set(exe fairmq-pmix-command-ui)