[PATCH] Cleanup SLHC configuration

Convert selection of serial line header compression to use CONFIG_SLHC
rather than makefile ifeq uglyness.  This makes it easier to select
the SLHC module from other code.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/isdn/i4l/Kconfig b/drivers/isdn/i4l/Kconfig
index a4f7288..3ef567b 100644
--- a/drivers/isdn/i4l/Kconfig
+++ b/drivers/isdn/i4l/Kconfig
@@ -5,6 +5,7 @@
 config ISDN_PPP
 	bool "Support synchronous PPP"
 	depends on INET
+	select SLHC
 	help
 	  Over digital connections such as ISDN, there is no need to
 	  synchronize sender and recipient's clocks with start and stop bits