fix: circuits should not link openmp with -DMULTITHREADING (#1929)

We now have other multithreading paradigms. This aligns with
barretenberg.

circuits/cpp/cmake/threading.cmake

@@ -1,10 +1,26 @@
 if(MULTITHREADING)
-    find_package(OpenMP REQUIRED)
     message(STATUS "Multithreading is enabled.")
-    link_libraries(OpenMP::OpenMP_CXX)
+    add_compile_options(-pthread)
+    add_link_options(-pthread)
+    if(WASM)
+        add_compile_options(--target=wasm32-wasi-threads)
+        add_link_options(--target=wasm32-wasi-threads)
+    endif()
+    #add_compile_options(-fsanitize=thread)
+    #add_link_options(-fsanitize=thread)
 else()
     message(STATUS "Multithreading is disabled.")
-    add_definitions(-DNO_MULTITHREADING -DBOOST_SP_NO_ATOMIC_ACCESS)
+    add_definitions(-DNO_MULTITHREADING)
+    set(OMP_MULTITHREADING OFF)
+endif()
+
+if(OMP_MULTITHREADING)
+    find_package(OpenMP REQUIRED)
+    message(STATUS "OMP multithreading is enabled.")
+    link_libraries(OpenMP::OpenMP_CXX)
+else()
+    message(STATUS "OMP multithreading is disabled.")
+    add_definitions(-DNO_OMP_MULTITHREADING)
 endif()
 
 if(DISABLE_TBB)