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 09b856e..92b13ca 100644
--- a/tests/file_open_test.c
+++ b/tests/file_open_test.c
@@ -4,6 +4,11 @@
 #include "cbehave.h"
 #include "util.h"
 
+#define ASSERT(cond, ret) \
+if (!(cond)) {\
+    cbehave_feature_return(__FILE__, __LINE__, ret, _state); \
+    goto _feature_over; \
+}\
 
 FEATURE(file_open, "File open")
 	SCENARIO("Open file in current directory")
@@ -34,4 +39,7 @@ 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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<div class='path'>path: <a href='/guix/log/?id=58ade30228ec692150d7ae1babdd013a5c8b2034'>root</a>/<a href='/guix/log/hydra.gnu.org.pub?id=58ade30228ec692150d7ae1babdd013a5c8b2034'>hydra.gnu.org.pub</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/hydra.gnu.org.pub?id=58ade30228ec692150d7ae1babdd013a5c8b2034&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
mit message (<a href='/guix/log/gnu/tests/ldap.scm?id=354afe47341e20b3faf5ebdddb51ee83cc1da1d6&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-18 10:31:59 +0200'>2021-04-18</span></td><td><a href='/guix/commit/gnu/tests/ldap.scm?id=868d8068a0b0ea985c6f8d28cb7a436c96bd4de5'>tests: ldap: Fix it.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes: &lt;https://issues.guix.gnu.org/47745&gt;.

* gnu/tests/ldap.scm (run-ldap-test): Use a password with more that 8
characters so that dscreate doesn't fail.
</span></span></td><td>Mathieu Othacehe</td></tr>