qt: remove Makefile variable QT_QMAKE_AR

The variable is only referenced once, so inline it.

Signed-off-by: Michael Roth <mroth@nessie.de>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/qt/qt.mk

@@ -375,8 +375,6 @@ endif
 
 QT_QMAKE_CONF:=$(QT_TARGET_DIR)/mkspecs/qws/linux-$(BR2_PACKAGE_QT_EMB_PLATFORM)-g++/qmake.conf
 
-QT_QMAKE_AR:=$(TARGET_AR) cqs
-
 # Variable for other Qt applications to use
 QT_QMAKE:=$(STAGING_DIR)/usr/bin/qmake -spec qws/linux-$(BR2_PACKAGE_QT_EMB_PLATFORM)-g++
 
@@ -437,7 +435,7 @@ endif
 	$(call QT_QMAKE_SET,CXX,$(TARGET_CXX))
 	$(call QT_QMAKE_SET,LINK,$(TARGET_CXX))
 	$(call QT_QMAKE_SET,LINK_SHLIB,$(TARGET_CXX))
-	$(call QT_QMAKE_SET,AR,$(QT_QMAKE_AR))
+	$(call QT_QMAKE_SET,AR,$(TARGET_AR) cqs)
 	$(call QT_QMAKE_SET,OBJCOPY,$(TARGET_OBJCOPY))
 	$(call QT_QMAKE_SET,RANLIB,$(TARGET_RANLIB))
 	$(call QT_QMAKE_SET,STRIP,$(TARGET_STRIP))