tracker: fix PIE

See #4572

srcpkgs/tracker/template

@@ -1,7 +1,7 @@
 # Template file for 'tracker'
 pkgname=tracker
 version=1.6.1
-revision=2
+revision=3
 build_style=gnu-configure
 configure_args="--enable-libflac --enable-libvorbis --disable-unit-tests
  --enable-libtiff --disable-static --enable-network-manager
@@ -31,6 +31,10 @@ if [ -z "$CROSS_BUILD" ]; then
 fi
 
 pre_configure() {
+	# Set AM_LDFLAGS in subdir's Makefile.am because adding the
+	# option subdir-objects to configure.ac does not work.
+	sed -e"/^AM_CPPFLAGS/i AM_LDFLAGS = ${LDFLAGS}" \
+		-i src/*/Makefile.am src/*/*/Makefile.am
 	autoreconf -fi
 }