qemu: fix distfile extraction.

srcpkgs/qemu/template

@@ -3,6 +3,7 @@ pkgname=qemu
 version=1.1.1
 revision=1
 nostrip=yes
+noextract=yes
 build_style=configure
 configure_args="--prefix=/usr --sysconfdir=/etc --enable-spice
 --enable-kvm --audio-drv-list=alsa,sdl,pa --disable-xen
@@ -26,6 +27,11 @@ long_desc="
  one machine (e.g. an ARM board) on a different machine (e.g. your own PC).
  By using dynamic translation, it achieves very good performances."
 
+do_extract() {
+	# XXX distfile is not bzip2 compressed! it's in gzip format.
+	tar xfz $XBPS_SRCDISTDIR/qemu-${version}.tar.bz2 -C $XBPS_BUILDDIR
+}
+
 pre_configure() {
 	sed -i -e 's/lib64/lib/g' x86_64.ld
 }