[balsa] libbalsa/imap/meson.build: Add top_include path

[Peter Bloomfield <peterb src gnome org>]

commit 912a649cf4b4d3f17ed89bab47351486504b3ff2
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Mon Sep 7 17:36:45 2020 -0400

    libbalsa/imap/meson.build: Add top_include path
    
    when compiling imap_tst. Master builds fine without it, but the
    oauth2-support branch does not! Fails to include config.h…

 libbalsa/imap/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libbalsa/imap/meson.build b/libbalsa/imap/meson.build
index 34918b947..ed1e977d0 100644
--- a/libbalsa/imap/meson.build
+++ b/libbalsa/imap/meson.build
@@ -37,5 +37,5 @@ imap_tst_sources = 'imap_tst.c'
 imap_tst = executable('imap_tst', imap_tst_sources,
                       link_with           : [libimap_a, libnetclient_a],
                       dependencies        : balsa_deps,
-                      include_directories : libnetclient_include,
+                      include_directories : [top_include, libnetclient_include],
                       install             : false)