Add SKIPREADLINE support to make and cmake

It's mostly for headless support.
At the moment, for interactive uage without readline, some commands will exit the client prematurely if they use kbd_enter_pressed().

client/src/ui.c

@@ -22,7 +22,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 
-#ifndef ANDROID
+#ifdef HAVE_READLINE
 #include <readline/readline.h>
 #endif
 
@@ -297,8 +297,6 @@ void PrintAndLogEx(logLevel_t level, const char *fmt, ...) {
 }
 
 static void fPrintAndLog(FILE *stream, const char *fmt, ...) {
-    char *saved_line;
-    int saved_point;
     va_list argptr;
     static FILE *logfile = NULL;
     static int logging = 1;
@@ -344,6 +342,8 @@ static void fPrintAndLog(FILE *stream, const char *fmt, ...) {
 #ifdef RL_STATE_READCMD
     // We are using GNU readline. libedit (OSX) doesn't support this flag.
     int need_hack = (rl_readline_state & RL_STATE_READCMD) > 0;
+    char *saved_line;
+    int saved_point;
 
     if (need_hack) {
         saved_point = rl_point;