patch 8.0.1036: ++eof argument for terminal only available on MS-Windows

Problem:    ++eof argument for terminal only available on MS-Windows.
Solution:   Also support ++eof on Unix.  Add a test.
diff --git a/src/channel.c b/src/channel.c
index 5a7e2a7..30a4304 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -1422,9 +1422,8 @@
     in_part->ch_buf_top = lnum;
     if (lnum > buf->b_ml.ml_line_count || lnum > in_part->ch_buf_bot)
     {
-#if defined(WIN32) && defined(FEAT_TERMINAL)
-	/* Send CTRL-D or "eof_chars" to close stdin on Windows. A console
-	 * application doesn't treat closing stdin like UNIX. */
+#if defined(FEAT_TERMINAL)
+	/* Send CTRL-D or "eof_chars" to close stdin on MS-Windows. */
 	if (channel->ch_job != NULL)
 	    term_send_eof(channel);
 #endif
@@ -4640,7 +4639,6 @@
 	    }
 	    else if (STRCMP(hi->hi_key, "eof_chars") == 0)
 	    {
-# ifdef WIN3264
 		char_u *p;
 
 		if (!(supported2 & JO2_EOF_CHARS))
@@ -4652,7 +4650,6 @@
 		    EMSG2(_(e_invarg2), "term_opencmd");
 		    return FAIL;
 		}
-# endif
 	    }
 	    else if (STRCMP(hi->hi_key, "term_rows") == 0)
 	    {