Use /usr/lib instead of /lib for flex

package/flex/Config.in

@@ -8,9 +8,9 @@ config BR2_PACKAGE_FLEX
 	  http://www.gnu.org/software/flex/
 
 config BR2_PACKAGE_FLEX_LIBFL
-	bool "Install libfl.a under staging_dir/lib"
+	bool "Install libfl.a under staging_dir/usr/lib"
 	default y
 	depends on BR2_PACKAGE_FLEX
 	help
-	  Install libfl.a under staging_dir/lib for further development
+	  Install libfl.a under staging_dir/usr/lib for further development
 	  on a host machine.

package/flex/flex.mk

@@ -77,7 +77,7 @@ $(TARGET_DIR)/$(FLEX_TARGET_BINARY): $(FLEX_DIR)/$(FLEX_BINARY)
 	    includedir=$(TARGET_DIR)/usr/include \
 	    -C $(FLEX_DIR) install
 ifeq ($(strip $(BR2_PACKAGE_FLEX_LIBFL)),y)
-	install -D $(FLEX_DIR)/libfl.a $(STAGING_DIR)/lib/libfl.a
+	install -D $(FLEX_DIR)/libfl.a $(STAGING_DIR)/usr/lib/libfl.a
 endif
 ifneq ($(BR2_HAVE_INFOPAGES),y)
 	rm -rf $(TARGET_DIR)/usr/share/info