libmad: Drop custom staging function

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

meta/packages/libmad/libmad_0.15.1b.bb

@@ -11,7 +11,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/mad/libmad-${PV}.tar.gz \
 
 S = "${WORKDIR}/libmad-${PV}"
 
-inherit autotools pkgconfig
+inherit autotools_stage pkgconfig
 
 EXTRA_OECONF = "-enable-speed --enable-shared"
 # The ASO's don't take any account of thumb...
@@ -23,9 +23,4 @@ do_configure_prepend () {
 	touch NEWS AUTHORS ChangeLog
 }
 
-do_stage() {
-	oe_libinstall -so libmad ${STAGING_LIBDIR}
-	install -m 0644 mad.h ${STAGING_INCDIR}
-}
-
 ARM_INSTRUCTION_SET = "arm"