BUILDBOT: Switch most build packaging using bzip2 compression to xz.

As the buildbot VM has issues with low disk space currently, changing
to the LZMA based xz format instead of bz2 for most packages will help
with this.

config/master.cfg

@@ -135,7 +135,7 @@ p = {
 		#"scummvm-tools", # GUI tools currently not built - WxWidgets library not present
 		"scummvm-tools-cli"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["debian-x86"] = p
@@ -187,7 +187,7 @@ p = {
 		#"scummvm-tools", # GUI tools currently not built - WxWidgets library not present
 		"scummvm-tools-cli"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["debian-x86_64"] = p
@@ -222,7 +222,7 @@ p = {
 		#"scummvm-tools", # GUI tools currently not built - WxWidgets library not present
 		"scummvm-tools-cli"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["debian-x86-clang"] = p
@@ -346,7 +346,7 @@ p = {
 	"env": scumm_env_wii,
 	"disttarget": "wiidist",
 	"package": [ "wiidist/scummvm" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["wii"] = p
@@ -372,7 +372,7 @@ p = {
 	"env": scumm_env_gc,
 	"disttarget": "wiidist",
 	"package": [ "wiidist/scummvm" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["gamecube"] = p
@@ -401,7 +401,7 @@ p_master = {
 		"scummvm.ds.gba",
 		"plugins"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 p_stable = copy.deepcopy(p_master)
@@ -455,7 +455,7 @@ p = {
 		#"scummvm-tools.app", # GUI tools currently not built - WxWidgets library not present
 		"scummvm-tools-cli"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["osx_intel"] = p
@@ -500,7 +500,7 @@ p = {
 		#"scummvm-tools.app", # GUI tools currently not built - WxWidgets library not present
 		"scummvm-tools-cli"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["osx_ppc"] = p
@@ -526,7 +526,7 @@ p = {
 	"env": scumm_env_iphone,
 	"disttarget": "iphonebundle",
 	"package": [ "ScummVM.app" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["iphone"] = p
@@ -553,7 +553,7 @@ p_master = {
 		"EBOOT.PBP",
 		"plugins"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 p_stable = copy.deepcopy(p_master)
@@ -592,7 +592,7 @@ p = {
 		"scummvm.elf",
 		"plugins"
 	],	# TODO/FIXME: What to package?
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["ps2"] = p
@@ -681,7 +681,7 @@ p = {
 	"env": scumm_env_dc,
 	"disttarget": "dcdist",
 	"package": [ "dcdist/scummvm" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["dc"] = p
@@ -763,7 +763,7 @@ p = {
 	"env": scumm_env_motoezx,
 	"disttarget": "motoezx",
 	"package": [ "release/ScummVM-motoezx.pkg" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["motoezx"] = p
@@ -785,7 +785,7 @@ p = {
 	"env": scumm_env_motomagx,
 	"disttarget": "motomagx-mpkg",
 	"package": [ "release/ScummVM-motomagx.mpkg" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["motomagx"] = p
@@ -808,7 +808,7 @@ p = {
 	"env": scumm_env_n64,
 	"strip": "%s/bin/mips64-strip scummvm.elf" % scumm_root_n64,
 	"package": [ "scummvm.elf" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["n64"] = p
@@ -832,7 +832,7 @@ p = {
 		"scummvm",
 		"plugins"
 	],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["dingux"] = p
@@ -962,7 +962,7 @@ p = {
 	"env": scumm_env_webos,
 	"disttarget": "package",
 	"package": [ "portdist" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["webos"] = p
@@ -983,7 +983,7 @@ p = {
 	"env": scumm_env_ps3,
 	"disttarget": "ps3pkg",
 	"package": [ "scummvm-ps3.pkg" ],
-	"archive_format": "tar.bz2"
+	"archive_format": "tar.xz"
 }
 
 scumm_platforms_master["ps3"] = p