cli: Fix for rl_startup_hook function signatures mismatch (-lreadline vs -ledit)

The rl_startup_hook function has different prototype in libreadline and
in the libedit.

To fix this issue, arguments of hook function has been wrapped to C
preprocessor macro and properly adjusted.

src/nmcli/agent.c

@@ -53,8 +53,7 @@ usage_agent_all(void)
 
 /* for pre-filling a string to readline prompt */
 static char *pre_input_deftext;
-static int
+static int   set_deftext(_NMC_RL_STARTUPHOOK_ARGS)
-set_deftext(void)
 {
     if (pre_input_deftext && rl_startup_hook) {
         rl_insert_text(pre_input_deftext);

src/nmcli/common.c

@@ -1136,8 +1136,7 @@ nmc_rl_gen_func_ifnames(const char *text, int state)
 /* for pre-filling a string to readline prompt */
 char *nmc_rl_pre_input_deftext;
 
-int
+int nmc_rl_set_deftext(_NMC_RL_STARTUPHOOK_ARGS)
-nmc_rl_set_deftext(void)
 {
     if (nmc_rl_pre_input_deftext && rl_startup_hook) {
         rl_insert_text(nmc_rl_pre_input_deftext);

src/nmcli/common.h

@@ -50,9 +50,17 @@ char *           nmc_rl_gen_func_ifnames(const char *text, int state);
 gboolean         nmc_get_in_readline(void);
 void             nmc_set_in_readline(gboolean in_readline);
 
+#if HAVE_EDITLINE_READLINE
+/* libedit has different signature for rl_startup_hook function */
+#define _NMC_RL_STARTUPHOOK_ARGS const char *c, int i
+#else
+/* By default the libreadline shall be used */
+#define _NMC_RL_STARTUPHOOK_ARGS void
+#endif
+
 /* for pre-filling a string to readline prompt */
 extern char *nmc_rl_pre_input_deftext;
-int          nmc_rl_set_deftext(void);
+int          nmc_rl_set_deftext(_NMC_RL_STARTUPHOOK_ARGS);
 
 char *nmc_parse_lldp_capabilities(guint value);