Fix alarm(0) failure on mingw32

A new test for mbedtls_timing_alarm(0) was introduced in PR 1136, which also
fixed it on Unix. Apparently test results on MinGW were not checked at that
point, so we missed that this new test was also failing on this platform.
diff --git a/ChangeLog b/ChangeLog
index 64a95d3..c18ac5b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -108,7 +108,7 @@
    * Fix incorrect unit in benchmark output. #850
    * Fix crash when calling mbedtls_ssl_cache_free() twice. Found by
      MilenkoMitrovic, #1104
-   * Fix mbedtls_timing_alarm(0) on Unix.
+   * Fix mbedtls_timing_alarm(0) on Unix and MinGW.
    * Fix use of uninitialized memory in mbedtls_timing_get_timer when reset=1.
    * Fix possible memory leaks in mbedtls_gcm_self_test().
    * Added missing return code checks in mbedtls_aes_self_test().