wifi: pseudo library to install firmware

The patch prevents linking wifi_drv on each build.

repos/dde_linux/lib/mk/iwl_firmware.mk

@@ -0,0 +1,14 @@
+#
+# Pseudo library to copy Intel Wireless firmware to build directory
+#
+
+WIFI_CONTRIB_DIR := $(call select_from_ports,dde_linux)
+
+IMAGES  := $(notdir $(wildcard $(WIFI_CONTRIB_DIR)/firmware/*.ucode))
+BIN_DIR := $(BUILD_BASE_DIR)/bin
+FW_DIR  := $(WIFI_CONTRIB_DIR)/firmware
+
+all: $(addprefix $(BIN_DIR)/,$(IMAGES))
+
+$(BIN_DIR)/%.ucode: $(FW_DIR)/%.ucode
+	$(VERBOSE)cp $^ $@

repos/dde_linux/src/drivers/wifi/target.mk

@@ -1,16 +1,6 @@
 TARGET   = wifi_drv
 SRC_CC   = main.cc
-LIBS     = wifi wpa_supplicant server
+LIBS     = wifi iwl_firmware wpa_supplicant server
 
 # needed for firmware.h
 INC_DIR += $(REP_DIR)/src/lib/wifi/include
-
-#
-# Copy all firmware images to the build directory
-#
-WIFI_CONTRIB_DIR := $(call select_from_ports,dde_linux)
-$(TARGET): firmware_images
-firmware_images:
-	$(VERBOSE)for img in $(WIFI_CONTRIB_DIR)/firmware/*.ucode; do \
-		cp $$img $(PWD)/bin; \
-	done