blockchain_import: Check bit width for more than just WIN32

Pass the CMake bit width setting to compile flags for blockchain_import
and blockchain_converter.

For LMDB on 32-bit, hyc has found that batch size of 100 appears to be a
good default.

src/blockchain_utilities/CMakeLists.txt

@@ -99,6 +99,11 @@ target_link_libraries(blockchain_converter
 	blockchain_db
     ${CMAKE_THREAD_LIBS_INIT})
 
+if(${ARCH_WIDTH} EQUAL 32)
+  target_compile_definitions(blockchain_converter
+    PUBLIC -DARCH_WIDTH=32)
+endif()
+
 add_dependencies(blockchain_converter
 	version)
 set_property(TARGET blockchain_converter
@@ -117,6 +122,11 @@ target_link_libraries(blockchain_import
 	p2p
     ${CMAKE_THREAD_LIBS_INIT})
 
+if(${ARCH_WIDTH} EQUAL 32)
+  target_compile_definitions(blockchain_import
+    PUBLIC -DARCH_WIDTH=32)
+endif()
+
 add_dependencies(blockchain_import
 	version)
 set_property(TARGET blockchain_import