Fix build failures caused by not compiling open_transformer.c (#2)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/libarchive/Kbuild.src b/archival/libarchive/Kbuild.src
index d81682b..968fdf8 100644
--- a/archival/libarchive/Kbuild.src
+++ b/archival/libarchive/Kbuild.src
@@ -56,6 +56,9 @@
 lib-$(CONFIG_RPM2CPIO)                  += open_transformer.o decompress_gunzip.o get_header_cpio.o
 lib-$(CONFIG_RPM)                       += open_transformer.o decompress_gunzip.o get_header_cpio.o
 
+lib-$(CONFIG_GZIP)                      += open_transformer.o
+lib-$(CONFIG_BZIP2)                     += open_transformer.o
+lib-$(CONFIG_LZOP)                      += open_transformer.o
 lib-$(CONFIG_MAN)                       += open_transformer.o
 lib-$(CONFIG_SETFONT)                   += open_transformer.o
 lib-$(CONFIG_FEATURE_2_4_MODULES)       += open_transformer.o