mg2d: add a function for getting maximum supported fd_stencil

This is needed for the caller to know the number of boundary zones that
can be filled.

API bump.

1 files changed, 1 insertions, 1 deletions

diff --git a/libmg2d.v b/libmg2d.v
index a51d313..ec37512 100644
--- a/libmg2d.v
+++ b/libmg2d.v
@@ -1,4 +1,4 @@
-LIBMG2D_3 {
+LIBMG2D_4 {
     global: mg2d_*;
     local: *;
 };