dropbear: Make utmp and putuline support configurable via seperate config options

Utmp support tracks who is currenlty logged in by logging info to the file /var/run/utmp (supported by busybox)
Putuline support will use the utmp structure to write to the utmp file

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

package/network/services/dropbear/Config.in

@@ -32,4 +32,19 @@ config DROPBEAR_ECC
 
 		Increases binary size by about 23 kB (MIPS).
 
+config DROPBEAR_UTMP
+	bool "Utmp support"
+	default n
+	depends on BUSYBOX_CONFIG_FEATURE_UTMP
+	help
+		This enables dropbear utmp support, the file /var/run/utmp is used to
+		track who is currently logged in.
+
+config DROPBEAR_PUTUTLINE
+	bool "Pututline support"
+	default n
+	depends on DROPBEAR_UTMP
+	help
+		Dropbear will use pututline() to write the utmp structure into the utmp file.
+
 endmenu

package/network/services/dropbear/Makefile

@@ -68,12 +68,11 @@ CONFIGURE_ARGS += \
 	--enable-syslog \
 	$(if $(CONFIG_SHADOW_PASSWORDS),,--disable-shadow) \
 	--disable-lastlog \
-	--disable-utmp \
-	--disable-utmpx \
+	$(if $(CONFIG_DROPBEAR_UTMP),,--disable-utmp) \
 	--disable-wtmp \
 	--disable-wtmpx \
 	--disable-loginfunc \
-	--disable-pututline \
+	$(if $(CONFIG_DROPBEAR_PUTUTLINE),,--disable-pututline) \
 	--disable-pututxline \
 	--disable-zlib \
 	--enable-bundled-libtom