test1545: disable deprecation warnings

Fixes:
https://ci.appveyor.com/project/curlorg/curl/builds/48631551/job/bhx74e0i66yrp6pk#L1205

Same with details:
https://ci.appveyor.com/project/curlorg/curl/builds/48662893/job/ol8a78q9gmilb6wt#L1263
```
tests/libtest/lib1545.c:38:3: error: 'curl_formadd' is deprecated: since 7.56.0. Use curl_mime_init() [-Werror=deprecated-declarations]
   38 |   curl_formadd(&m_formpost, &lastptr, CURLFORM_COPYNAME, "file",
      |   ^~~~~~~~~~~~
[...]
```

Follow-up to 07a3cd83e0456ca17dfd8c3104af7cf45b7a1ff5 #12421

Fixes #12445
Closes #12444

diff --git a/tests/libtest/lib1545.c b/tests/libtest/lib1545.c
index 9278b2a5cbc7747982a04e7b213dfb7ce2edacea..f31baa0c4d6872388ccf7c9795861b2cca39b16d 100644 (file)
--- a/tests/libtest/lib1545.c
+++ b/tests/libtest/lib1545.c
@@ -21,6 +21,9 @@
  * SPDX-License-Identifier: curl
  *
  ***************************************************************************/
+#ifndef CURL_DISABLE_DEPRECATION
+#define CURL_DISABLE_DEPRECATION  /* Using and testing the form api */
+#endif
 #include "test.h"
 
 int test(char *URL)