$NetBSD: patch-doc_meson.build,v 1.2 2019/10/27 10:34:36 nia Exp $

Work around our weird sphinx binary name.

--- doc/meson.build.orig	2019-04-10 09:08:34.000000000 +0000
+++ doc/meson.build
@@ -1,4 +1,4 @@
-sphinx = find_program('sphinx-build', required: get_option('documentation'))
+sphinx = find_program('sphinx-build-@PYVERSSUFFIX@', required: get_option('documentation'))
 if not sphinx.found()
   subdir_done()
 endif