patch 8.0.0902: cannot specify directory or environment for a job

Problem:    Cannot specify directory or environment for a job.
Solution:   Add the "cwd" and "env" arguments to job options. (Yasuhiro
            Matsumoto, closes #1160)
diff --git a/src/channel.c b/src/channel.c
index 7eb6ce7..3126cbd 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -4153,6 +4153,8 @@
 	partial_unref(opt->jo_exit_partial);
     else if (opt->jo_exit_cb != NULL)
 	func_unref(opt->jo_exit_cb);
+    if (opt->jo_env != NULL)
+	dict_unref(opt->jo_env);
 }
 
 /*
@@ -4433,6 +4435,26 @@
 		opt->jo_term_finish = *val;
 	    }
 #endif
+	    else if (STRCMP(hi->hi_key, "env") == 0)
+	    {
+		if (!(supported & JO2_ENV))
+		    break;
+		opt->jo_set |= JO2_ENV;
+		opt->jo_env = item->vval.v_dict;
+		++item->vval.v_dict->dv_refcount;
+	    }
+	    else if (STRCMP(hi->hi_key, "cwd") == 0)
+	    {
+		if (!(supported & JO2_CWD))
+		    break;
+		opt->jo_cwd = get_tv_string_buf_chk(item, opt->jo_cwd_buf);
+		if (opt->jo_cwd == NULL || !mch_isdir(opt->jo_cwd))
+		{
+		    EMSG2(_(e_invarg2), "cwd");
+		    return FAIL;
+		}
+		opt->jo_set |= JO2_CWD;
+	    }
 	    else if (STRCMP(hi->hi_key, "waittime") == 0)
 	    {
 		if (!(supported & JO_WAITTIME))