avrdude: fix musl compatibility

- Build with -D_GNU_SOURCE to expose "loff_t" required for libelf.h
 - Include sys/types.h before usb.h to provide missing u_int*_t types

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

utils/avrdude/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=avrdude
 PKG_VERSION:=6.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://download.savannah.gnu.org/releases/avrdude
@@ -40,6 +40,9 @@ CONFIGURE_ARGS+= \
 	--disable-doc \
 	--disable-parport \
 
+TARGET_CFLAGS+= \
+	-D_GNU_SOURCE \
+
 define Package/avrdude/conffiles
 /etc/avrdude.conf
 endef