printutils/*: convert to new-style "one file" applets

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/printutils/Kbuild.src b/printutils/Kbuild.src
index 194fe01..10c8230 100644
--- a/printutils/Kbuild.src
+++ b/printutils/Kbuild.src
@@ -4,6 +4,4 @@
 
 lib-y :=
 
-lib-$(CONFIG_LPD) += lpd.o
-lib-$(CONFIG_LPR) += lpr.o
-lib-$(CONFIG_LPQ) += lpr.o
+INSERT