patchelf: use .tar.bz2 archive

Saves a little space and network bandwidth.

While at it, use PATCHELF_VERSION for PATCHELF_SITE.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/patchelf/patchelf.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256	f2aa40a6148cb3b0ca807a1bf836b081793e55ec9e5540a5356d800132be7e0a	patchelf-0.9.tar.gz
+sha256	a0f65c1ba148890e9f2f7823f4bedf7ecad5417772f64f994004f59a39014f83	patchelf-0.9.tar.bz2

package/patchelf/patchelf.mk

@@ -5,7 +5,8 @@
 ################################################################################
 
 PATCHELF_VERSION = 0.9
-PATCHELF_SITE = http://releases.nixos.org/patchelf/patchelf-0.9
+PATCHELF_SITE = http://releases.nixos.org/patchelf/patchelf-$(PATCHELF_VERSION)
+PATCHELF_SOURCE = patchelf-$(PATCHELF_VERSION).tar.bz2
 PATCHELF_LICENSE = GPLv3+
 PATCHELF_LICENSE_FILES = COPYING