control: B-D on opkbuild with better "clean" naming

Fixes errors like:

	Warning: Duplicate clean binary package name: "LIBNCURSES6"

1 files changed, 1 insertions, 1 deletions

diff --git a/control b/control
index d2700d9..b126db1 100644
--- a/control
+++ b/control
@@ -1,3 +1,3 @@
 Maintainer: Patrick McDermott <patrick.mcdermott@libiquity.com>
-Build-Depends: opkbuild (>= 4.0.1), opkhelper-3.0 (>= 3.1.2), gpg, dirmngr
+Build-Depends: opkbuild (>= 4.1.2), opkhelper-3.0 (>= 3.1.2), gpg, dirmngr
 Homepage: https://invisible-island.net/ncurses/