qtuio: use TARGET_MAKE_ENV when running make and qmake

This patch prepends TARGET_MAKE_ENV to $(MAKE) and $(QT_QMAKE) command
lines, to make sure PATH is set correctly, and to line up with the qt5
packages that do this consistently.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qtuio/qtuio.mk

@@ -19,13 +19,13 @@ QTUIO_EXAMPLES = dials fingerpaint knobs pinchzoom
 ifeq ($(BR2_QTUIO_EXAMPLES),y)
 define QTUIO_CONFIGURE_EXAMPLES
 	for example in $(QTUIO_EXAMPLES) ; do \
-		(cd $(@D)/examples/$${example} && $(QT_QMAKE)) ; \
+		(cd $(@D)/examples/$${example} && $(TARGET_MAKE_ENV) $(QT_QMAKE)) ; \
 	done
 endef
 endif
 
 define QTUIO_CONFIGURE_CMDS
-	cd $(@D)/src && $(QT_QMAKE)
+	cd $(@D)/src && $(TARGET_MAKE_ENV) $(QT_QMAKE)
 	$(QTUIO_CONFIGURE_EXAMPLES)
 endef
 
@@ -38,7 +38,7 @@ endef
 endif
 
 define QTUIO_BUILD_CMDS
-	$(MAKE) -C $(@D)/src
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)/src
 	$(QTUIO_BUILD_EXAMPLES)
 endef