io: Add TARGET_LDFLAGS to fix PIE

Add the OpenWrt TARGET_LDFLAGS to the compile command to activate PIE support
for the io tool when it is activated globally in OpenWrt.

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>

utils/io/Makefile

@@ -6,7 +6,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=io
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -25,7 +25,8 @@ define Package/io/description
 endef
 
 define Build/Compile
-	$(TARGET_CC) $(TARGET_CFLAGS) -Wall $(PKG_BUILD_DIR)/io.c -o $(PKG_BUILD_DIR)/$(PKG_NAME)
+	$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) -Wall \
+		$(PKG_BUILD_DIR)/io.c -o $(PKG_BUILD_DIR)/$(PKG_NAME)
 endef
 
 define Package/io/install