adds the generation of the offsetof defines to CMakeLists.txt

As the offsets into the TX_THREAD are needed to access certain fields and the members for smp are quite difficult to obtain this was the safest option

port/threadx_smp/cmake/GenerateAsmOffsets.cmake

@@ -0,0 +1,22 @@
+if(NOT DEFINED INPUT)
+    message(FATAL_ERROR "INPUT is required")
+endif()
+
+if(NOT DEFINED OUTPUT)
+    message(FATAL_ERROR "OUTPUT is required")
+endif()
+
+file(STRINGS "${INPUT}" OFFSET_LINES REGEX "->")
+
+set(OFFSET_CONTENT "/* Generated by GenerateAsmOffsets.cmake. */\n")
+
+foreach(LINE IN LISTS OFFSET_LINES)
+    string(REGEX MATCH "->([A-Za-z0-9_]+)[^0-9-]*(-?[0-9]+)" _ "${LINE}")
+    if(NOT CMAKE_MATCH_1)
+        continue()
+    endif()
+
+    string(APPEND OFFSET_CONTENT "#define ${CMAKE_MATCH_1} ${CMAKE_MATCH_2}\n")
+endforeach()
+
+file(WRITE "${OUTPUT}" "${OFFSET_CONTENT}")