message: [Build] QtConcurrent checks.
diff: @@ -474,6 +474,7 @@ AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG],[
  BITCOIN_QT_CHECK([AC_CHECK_HEADER([QLocalSocket],, BITCOIN_QT_FAIL(QtNetwork headers missing))])
  BITCOIN_QT_CHECK([AC_CHECK_HEADER([QtSvg],, BITCOIN_QT_FAIL(QtSvg headers missing))])
  BITCOIN_QT_CHECK([AC_CHECK_HEADER([QtCharts],, BITCOIN_QT_FAIL(QtCharts headers missing))])
  + BITCOIN_QT_CHECK([AC_CHECK_HEADER([QtConcurrent],, BITCOIN_QT_FAIL(QtConcurrent headers missing))])
  BITCOIN_QT_CHECK([
  if test "x$bitcoin_qt_want_version" = xauto; then
  @@ -509,6 +510,7 @@ AC_DEFUN([_BITCOIN_QT_FIND_LIBS_WITHOUT_PKGCONFIG],[
  BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Network],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Network not found)))
  BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Widgets],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Widgets not found)))
  BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Svg],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Svg not found)))
  + BITCOIN_QT_CHECK(AC_CHECK_LIB([${QT_LIB_PREFIX}Concurrent],[main],,BITCOIN_QT_FAIL(lib${QT_LIB_PREFIX}Concurrent not found)))
  QT_LIBS="$LIBS"
  LIBS="$TEMP_LIBS"
  