buildgcc: Search for `xz` too

Change-Id: I05d5f26f7cf9ab41b14aaecfe421b88ef9a2394a
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/18775
Tested-by: build bot (Jenkins)
Reviewed-by: Idwer Vollering <vidwer@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
index 1a7f61c0..24fd87ed 100755
--- a/util/crossgcc/buildgcc
+++ b/util/crossgcc/buildgcc
@@ -882,6 +882,7 @@
 searchtool clang "clang version" nofail > /dev/null || \
 searchtool clang "LLVM" "" "g++" > /dev/null
 searchtool bzip2 "bzip2," > /dev/null
+searchtool xz "XZ Utils" "" "xz-utils" > /dev/null
 
 if searchtool wget "GNU" nofail > /dev/null; then
 	download_showing_percentage() {