hsbench: add Hyperscan benchmarker

The hsbench tool provides an easy way to measure Hyperscan's
performance for a particular set of patterns and corpus of data
to be scanned.

tools/CMakeLists.txt

@@ -0,0 +1,19 @@
+find_package(Threads)
+
+# remove some warnings
+if(CMAKE_CXX_FLAGS MATCHES "-Wmissing-declarations" )
+    string(REPLACE "-Wmissing-declarations" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+endif()
+
+include_directories(${PROJECT_SOURCE_DIR})
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src)
+include_directories(${PROJECT_SOURCE_DIR}/util)
+
+# add any subdir with a cmake file
+file(GLOB dirents RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *)
+foreach(e ${dirents})
+    if(IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${e} AND
+       EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${e}/CMakeLists.txt)
+        add_subdirectory(${e})
+    endif ()
+endforeach ()