Make test work with upstream cbehave
(tinydir bundles a modified version)

diff --git a/tests/file_open_test.c b/tests/file_open_test.c
index 3e659bc..9f6f88d 100644
--- a/tests/file_open_test.c
+++ b/tests/file_open_test.c
@@ -19,4 +19,7 @@ FEATURE(file_open, "File open")
 	SCENARIO_END
 FEATURE_END
 
-CBEHAVE_RUN("File open:", TEST_FEATURE(file_open))
+int main(void) {
+	cbehave_feature _cfeatures[] = {{feature_idx(file_open)}};
+	return cbehave_runner("File open:", _cfeatures);
+}
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<tr><td><span title='2021-12-13 17:48:25 +0100'>2021-12-13</span></td><td><a href='/guix/commit/gnu/packages/nvi.scm?id=8394619baceb118df92e355377fd543bb1aa501a'>gnu: Simplify package inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>This commit was obtained by running:

  ./pre-inst-env guix style

without any additional argument.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-10-27 13:15:45 +0100'>2020-10-27</span></td><td><a href='/guix/commit/gnu/packages/nvi.scm?id=f0c609323e583c075e1af4329d4d9d84befeba52'>gnu: nvi: Add missing includes.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a follow-up of a01f32924423c45a0ffa50f6c1727be2a25ef75c.

* gnu/packages/nvi.scm (nvi): Add missing includes.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2020-10-27 13:11:15 +0100'>2020-10-27</span></td><td><a href='/guix/commit/gnu/packages/nvi.scm?id=a01f32924423c45a0ffa50f6c1727be2a25ef75c'>gnu: nvi: Fix cross-compilation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/nvi.scm (nvi)[arguments]: Add "vi_cv_sprintf_count=yes" to
configure flags when cross-compiling. Also add 'fix-configure phase.
[native-inputs]: Add "automake" that is required by the new phase.
</span></span></td><td>Mathieu Othacehe</td></tr>