patch 8.2.3329: v_lock not set when getting value of environment variable

Problem:    v_lock not set when getting value of environment variable.
Solution:   Set v_lock to zero.
diff --git a/src/typval.c b/src/typval.c
index 5a62fa0..cdb6175 100644
--- a/src/typval.c
+++ b/src/typval.c
@@ -2082,6 +2082,7 @@
 
 	rettv->v_type = VAR_STRING;
 	rettv->vval.v_string = string;
+	rettv->v_lock = 0;
     }
 
     return OK;
diff --git a/src/version.c b/src/version.c
index 4041be4..b8e17af 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3329,
+/**/
     3328,
 /**/
     3327,