build: Drop unneeded IOKit framework dependency

Author: hebasto

build-aux/m4/bitcoin_qt.m4

@@ -128,7 +128,6 @@ AC_DEFUN([BITCOIN_QT_CONFIGURE],[
       _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)],[-lqxcb -lxcb-static])
       AC_DEFINE(QT_QPA_PLATFORM_XCB, 1, [Define this symbol if the qt platform is xcb])
     elif test "x$TARGET_OS" = xdarwin; then
-      AX_CHECK_LINK_FLAG([[-framework IOKit]],[QT_LIBS="$QT_LIBS -framework IOKit"],[AC_MSG_ERROR(could not iokit framework)])
       _BITCOIN_QT_CHECK_STATIC_PLUGINS([Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin)],[-lqcocoa])
       AC_DEFINE(QT_QPA_PLATFORM_COCOA, 1, [Define this symbol if the qt platform is cocoa])
     elif test "x$TARGET_OS" = xandroid; then