qt4x11 bbclass: this is in the core layer now, drop from this one

Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

classes/qt4x11.bbclass

@@ -1,9 +0,0 @@
-DEPENDS_prepend = "${@["qt4-x11-free ", ""][(bb.data.getVar('PN', d, 1)[:12] == 'qt4-x11-free')]}"
-
-inherit qmake2
-
-QT_DIR_NAME = "qt4"
-QT_LIBINFIX = ""
-
-# Qt4 uses atomic instructions not supported in thumb mode
-ARM_INSTRUCTION_SET = "arm"