minidlna: fix build with newer musl

The configure script is totally broken and does not check for
clock_gettime. Define it manually.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

multimedia/minidlna/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=minidlna
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://git.code.sf.net/p/minidlna/git
@@ -48,7 +48,7 @@ define Package/minidlna/conffiles
 /etc/config/minidlna
 endef
 
-CONFIGURE_ARGS +=\
+CONFIGURE_ARGS += \
 	--with-libiconv-prefix="$(ICONV_PREFIX)" \
 	--with-libintl-prefix="$(INTL_PREFIX)" \
 	--with-os-name="OpenWrt Linux" \
@@ -57,6 +57,8 @@ CONFIGURE_ARGS +=\
 	--with-db-path="/var/run/minidlna" \
 	--with-log-path="/var/log"
 
+TARGET_CFLAGS += -DHAVE_CLOCK_GETTIME
+
 define Package/minidlna/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/minidlnad $(1)/usr/sbin/minidlnad