httpd,telnetd: make default port configurable

BusyBox on Termux can't use ports less than 1024 it's patched to change default port for httpd to 8080 and telnetd to 8023.

https://github.com/termux/termux-packages/blob/master/packages/busybox/0011-networking-telnetd-default-port.patch
https://github.com/termux/termux-packages/blob/master/packages/busybox/0010-networking-httpd-default-port.patch

To avoid such patches we can make port configurable.

function                                             old     new   delta
packed_usage                                       33920   33914      -6

Signed-off-by: Sergey Ponomarev <stokito@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

include/usage.src.h

@@ -31,6 +31,9 @@
 # define ADJTIME_PATH "/etc/adjtime"
 #endif
 
+#define STR1(s) #s
+#define STR(s)  STR1(s)
+
 INSERT
 
 #define busybox_notes_usage \