qt: remove unnecessary call to qstrip macro in Makefile

QT_CONFIGURE can never gain double quotes, so there
is no point to remove some.

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

@@ -315,7 +315,6 @@ else
 QT_CONFIGURE+= -no-stl
 endif
 
-QT_CONFIGURE:=$(call qstrip,$(QT_CONFIGURE))
 BR2_PACKAGE_QT_EMB_PLATFORM:=$(call qstrip,$(BR2_PACKAGE_QT_EMB_PLATFORM))
 
 # Figure out what libs to install in the target