ICU-22676 Undefine move32 since it is interpreted system call with MSVC ARM64

Author: rp9-next

icu4c/source/test/intltest/citrtest.cpp

@@ -101,6 +101,11 @@ class  SCharacterIterator : public CharacterIterator {
 
         return pos;
     }
+
+#ifdef move32
+    // One of the system headers right now is sometimes defining a conflicting macro we don't use
+#undef move32
+#endif
     virtual int32_t move32(int32_t delta, CharacterIterator::EOrigin origin) override {
         switch(origin) {
         case kStart: