Contrib: point ACLOCAL to appropriate place for tremor.

(cherry picked from commit 01dbb084e4d7d2b56856d3637aea9c4a9ae26e0a)
Signed-off-by: Konstantin Pavlov <thresh@videolan.org>

extras/contrib/src/Makefile

@@ -750,7 +750,7 @@ tremor: tremor-$(TREMOR_VERSION).tar.bz2
 endif
 
 .tremor: tremor .ogg
-	(cd $<; $(HOSTCC) ./autogen.sh $(HOSTCONF) --prefix=$(PREFIX) --disable-shared CFLAGS="$(NOTHUMB)" && make && make install)
+	(cd $<; ACLOCAL="aclocal -I $(PREFIX)/share/aclocal/" autoreconf && $(HOSTCC) ./configure $(HOSTCONF) --prefix=$(PREFIX) --disable-shared CFLAGS="$(NOTHUMB)" && make && make install)
 	$(INSTALL_NAME)
 	touch $@