StagingBuff: support both Mlock & IOUring pin; Use in IoUAssmEngn

We use io_uring_register_buffers() for IoUringAssemblyEngine instead
of using mlock(). This __appears__ to have reduced CPU utilization on
the Dell laptop. Could also be that we recently upgraded total RAM
from 8GiB to 32GiB.

commonLibs/attachmentSupport/CMakeLists.txt

@@ -1,3 +1,5 @@
+pkg_check_modules(ATTACHMENT_SUPPORT_URING REQUIRED liburing)
+
 add_library(attachmentSupport SHARED
 	compute.cpp
 	stimulusProducer.cpp
@@ -14,12 +16,21 @@ target_include_directories(attachmentSupport PUBLIC
 	${CMAKE_SOURCE_DIR}/include
 	${CMAKE_BINARY_DIR}/include
 )
+target_include_directories(attachmentSupport PRIVATE
+	${ATTACHMENT_SUPPORT_URING_INCLUDE_DIRS}
+)
 
 target_link_libraries(attachmentSupport PUBLIC
 	Boost::system
 	Boost::log
 	spinscale
 )
+target_link_libraries(attachmentSupport PRIVATE
+	${ATTACHMENT_SUPPORT_URING_LIBRARIES}
+)
+target_link_directories(attachmentSupport PRIVATE
+	${ATTACHMENT_SUPPORT_URING_LIBRARY_DIRS}
+)
 
 # Verify Boost dynamic dependencies after build
 add_custom_command(TARGET attachmentSupport POST_BUILD