patch 8.1.1038: Arabic support excludes Farsi

Problem:    Arabic support excludes Farsi.
Solution:   Add Farsi support to the Arabic support. (Ali Gholami Rudi,
            Ameretat Reith)
diff --git a/src/proto/arabic.pro b/src/proto/arabic.pro
index a004ef9..c93e246 100644
--- a/src/proto/arabic.pro
+++ b/src/proto/arabic.pro
@@ -1,3 +1,5 @@
 /* arabic.c */
+int arabic_maycombine(int two);
+int arabic_combine(int one, int two);
 int arabic_shape(int c, int *ccp, int *c1p, int prev_c, int prev_c1, int next_c);
 /* vim: set ft=c : */