Fix colors in phpdbg prompt

When using libedit with phpdbg, the prompt needs to have starting and
ending ignore characters added. These characters are defined by
RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE and depend whether
readline or libedit is used.

[skip ci]

Author: petk

sapi/phpdbg/phpdbg_utils.c

@@ -318,10 +318,16 @@ PHPDBG_API const char *phpdbg_get_prompt(void) /* {{{ */
 	}
 
 	/* create cached prompt */
-#ifndef HAVE_LIBEDIT
-	/* TODO: libedit doesn't seems to support coloured prompt */
+#if !defined(HAVE_PHPDBG_READLINE) || (defined(HAVE_PHPDBG_READLINE) && defined(RL_PROMPT_START_IGNORE) && defined(RL_PROMPT_END_IGNORE))
 	if ((PHPDBG_G(flags) & PHPDBG_IS_COLOURED)) {
-		ZEND_IGNORE_VALUE(asprintf(&PHPDBG_G(prompt)[1], "\033[%sm%s\033[0m ",
+		ZEND_IGNORE_VALUE(asprintf(&PHPDBG_G(prompt)[1],
+#if defined(HAVE_LIBEDIT) && defined(RL_PROMPT_START_IGNORE) && defined(RL_PROMPT_END_IGNORE)
+			"\1\033[%sm\2%s\1\033[0m\2 ",
+#elif defined(HAVE_LIBREADLINE) && defined(RL_PROMPT_START_IGNORE) && defined(RL_PROMPT_END_IGNORE)
+			"\001\033[%sm\002%s\001\033[0m\002 ",
+#else
+			"\033[%sm%s\033[0m ",
+#endif
 			PHPDBG_G(colors)[PHPDBG_COLOR_PROMPT]->code,
 			PHPDBG_G(prompt)[0]));
 	} else