patch 9.0.1400: find_file_in_path() is not reentrant

Problem:    find_file_in_path() is not reentrant.
Solution:   Instead of global variables pass pointers to the functions.
            (closes #12093)
diff --git a/src/version.c b/src/version.c
index 56f6cb4..b1d88f4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1400,
+/**/
     1399,
 /**/
     1398,