bzip2/lzma: proper Kconfig dependencies for the ramdisk options

Impact: Partial resolution of build failure

Make all the compression algorithms properly configurable, and make
sure the ramdisk options pull in the proper compression algorithms, as
they should.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

lib/Kconfig

@@ -97,6 +97,19 @@ config LZO_COMPRESS
 config LZO_DECOMPRESS
 	tristate
 
+#
+# These all provide a common interface (hence the apparent duplication with
+# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
+#
+config DECOMPRESS_GZIP
+	tristate
+
+config DECOMPRESS_BZIP2
+	tristate
+
+config DECOMPRESS_LZMA
+	tristate
+
 #
 # Generic allocator support is selected if needed
 #