qt: fix missing target

Fix :
 http://autobuild.buildroot.net/results/093/09302c153418c3af6dc4cdd12a0149505cfbca0b/
 http://autobuild.buildroot.net/results/96f/96f8a9758f0116aec999028fde1b9c983c143809/

sh target must be provided instead of generic to have the correct QT_NO_FPU
behaviour.

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qt/qt.mk

@@ -219,6 +219,8 @@ else ifeq ($(BR2_mips)$(BR2_mipsel),y)
 QT_EMB_PLATFORM = mips
 else ifeq ($(BR2_powerpc),y)
 QT_EMB_PLATFORM = powerpc
+else ifeq ($(BR2_sh4)$(BR2_sh4eb)$(BR2_sh4a)$(BR2_sh4aeb),y)
+QT_EMB_PLATFORM = sh
 else
 QT_EMB_PLATFORM = generic
 endif