patch 8.0.1182: cannot see or change mzscheme dll name

Problem:    Cannot see or change mzscheme dll name.
Solution:   Add 'mzschemedll' and 'mzschemegcdll'.
diff --git a/src/option.c b/src/option.c
index 4e2b929..2743f16 100644
--- a/src/option.c
+++ b/src/option.c
@@ -2008,6 +2008,24 @@
     {"mousetime",   "mouset",	P_NUM|P_VI_DEF,
 			    (char_u *)&p_mouset, PV_NONE,
 			    {(char_u *)500L, (char_u *)0L} SCRIPTID_INIT},
+    {"mzschemedll", NULL,   P_STRING|P_EXPAND|P_VI_DEF|P_SECURE,
+#if defined(DYNAMIC_MZSCHEME)
+			    (char_u *)&p_mzschemedll, PV_NONE,
+			    {(char_u *)DYNAMIC_MZSCH_DLL, (char_u *)0L}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)"", (char_u *)0L}
+#endif
+			    SCRIPTID_INIT},
+    {"mzschemegcdll", NULL, P_STRING|P_EXPAND|P_VI_DEF|P_SECURE,
+#if defined(DYNAMIC_MZSCHEME)
+			    (char_u *)&p_mzschemegcdll, PV_NONE,
+			    {(char_u *)DYNAMIC_MZGC_DLL, (char_u *)0L}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)"", (char_u *)0L}
+#endif
+			    SCRIPTID_INIT},
     {"mzquantum",  "mzq",   P_NUM,
 #ifdef FEAT_MZSCHEME
 			    (char_u *)&p_mzq, PV_NONE,