Squashfs: select DECOMPRESS_LZMA_NEEDED when including support for lzma

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
index 0294aa2..7ec5d7e 100644
--- a/fs/squashfs/Kconfig
+++ b/fs/squashfs/Kconfig
@@ -30,6 +30,7 @@
 	bool "Include support for LZMA compressed file systems"
 	depends on SQUASHFS
 	select DECOMPRESS_LZMA
+	select DECOMPRESS_LZMA_NEEDED
 
 config SQUASHFS_EMBEDDED