fix musl compile

package/madplay/Makefile

@@ -5,7 +5,7 @@ include ${TOPDIR}/rules.mk
 
 PKG_NAME:=		madplay
 PKG_VERSION:=		0.15.2b
-PKG_RELEASE:=		1
+PKG_RELEASE:=		2
 PKG_MD5SUM:=		6814b47ceaa99880c754c5195aa1aac1
 PKG_DESCR:=		MPEG audio player in fixed point
 PKG_SECTION:=		multimedia
@@ -19,6 +19,7 @@ include ${TOPDIR}/mk/package.mk
 
 $(eval $(call PKG_template,MADPLAY,madplay,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
 
+TARGET_CPPFLAGS+=	-D_GNU_SOURCE -D_POSIX_SOURCE
 CONFIGURE_ENV+=		BUILD_CC="${TARGET_CC}" HOSTCC=${CC_FOR_BUILD} \
 			LIBS="-lz" \
 			ac_cv_linux_vers=2 \