tools: xz: use .bz2 archive

In order to build XZ itself we cannot assume that XZ support is available,
so fetch the bz2 archive variant of its sources instead.

Also drop the FreeBSD portability patch and apply it at prepare time using
sed, to avoid a dependency on GNU patch which in turn depends on XZ support.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

tools/xz/Makefile

@@ -9,10 +9,10 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=xz
 PKG_VERSION:=5.2.2
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=@SF/lzmautils \
 		http://tukaani.org/xz
-PKG_MD5SUM:=f341b1906ebcdde291dd619399ae944600edc9193619dd0c0110a5f05bfcc89e
+PKG_MD5SUM:=6ff5f57a4b9167155e35e6da8b529de69270efb2b4cf3fbabf41a4ee793840b5
 
 HOST_BUILD_PARALLEL:=1
 
@@ -22,6 +22,14 @@ HOST_CONFIGURE_ARGS += \
 	--enable-static=yes \
 	--enable-shared=no \
 
+define Host/Prepare
+	$(call Host/Prepare/Default)
+
+	# FreeBSD portability fix
+	sed -i -e 's|#if defined(HAVE_BYTESWAP_H)|& \&\& !defined(__FreeBSD__)|' \
+		$(HOST_BUILD_DIR)/src/common/tuklib_integer.h
+endef
+
 define Host/Install
 	+$(MAKE) $(HOST_JOBS) -C $(HOST_BUILD_DIR) install xzlinks="unxz xzcat"
 endef

tools/xz/patches/100-freebsd-compat.patch

@@ -1,11 +0,0 @@
---- a/src/common/tuklib_integer.h
-+++ b/src/common/tuklib_integer.h
-@@ -48,7 +48,7 @@
- // Operating system specific features //
- ////////////////////////////////////////
- 
--#if defined(HAVE_BYTESWAP_H)
-+#if defined(HAVE_BYTESWAP_H) && !defined(__FreeBSD__)
- 	// glibc, uClibc, dietlibc
- #	include <byteswap.h>
- #	ifdef HAVE_BSWAP_16