lrzsz: install symlinks for XMODEM and YMODEM

This sets the protocol choice according to the program invocation name.
That is the common lrzsz installation practice.

Cc: Matthew Starr <mstarr@hedonline.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/lrzsz/lrzsz.mk

@@ -24,6 +24,10 @@ define LRZSZ_INSTALL_TARGET_CMDS
 	$(INSTALL) -m 0755 -D $(@D)/src/lsz $(TARGET_DIR)/usr/bin/sz
 	ln -sf rz $(TARGET_DIR)/usr/bin/lrz
 	ln -sf sz $(TARGET_DIR)/usr/bin/lsz
+	ln -sf rz $(TARGET_DIR)/usr/bin/rb
+	ln -sf sz $(TARGET_DIR)/usr/bin/sb
+	ln -sf rz $(TARGET_DIR)/usr/bin/rx
+	ln -sf sz $(TARGET_DIR)/usr/bin/sx
 endef
 
 $(eval $(autotools-package))