dropbear: link statically if BR2_PREFER_STATIC_LIB

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/dropbear/dropbear.mk

@@ -12,6 +12,10 @@ DROPBEAR_TARGET_BINS = dbclient dropbearkey dropbearconvert scp ssh
 DROPBEAR_MAKE =	$(MAKE) MULTI=1 SCPPROGRESS=1 \
 		PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"
 
+ifeq ($(BR2_PREFER_STATIC_LIB),y)
+DROPBEAR_MAKE += STATIC=1
+endif
+
 define DROPBEAR_FIX_XAUTH
 	$(SED) 's,^#define XAUTH_COMMAND.*/xauth,#define XAUTH_COMMAND "/usr/bin/xauth,g' $(@D)/options.h
 endef