package/python3: compile pyc verbosely when instructed

Only display the output of compileall.py when running verbosely,
otherwise suppress all non-error output.

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
Signed-off-by: Vincent Fazio <vfazio@xes-inc.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/python3/python3.mk

@@ -252,6 +252,7 @@ define PYTHON3_CREATE_PYC_FILES
 	PYTHONPATH="$(PYTHON3_PATH)" \
 	$(HOST_DIR)/bin/python$(PYTHON3_VERSION_MAJOR) \
 		$(PYTHON3_DIR)/Lib/compileall.py \
+		$(if $(VERBOSE),,-q) \
 		$(if $(BR2_PACKAGE_PYTHON3_PYC_ONLY),-b) \
 		-s $(TARGET_DIR) \
 		$(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)