cmake: include `curl/curl.h` as system header in integration tests

Follow-up to fb70812437ad28b74dbdc1031e46c1d86bc9db3c #16126

Closes #20651

diff --git a/tests/cmake/test.c b/tests/cmake/test.c
index e8d1209ac5c979e5bfa9047d72f121854bc4c900..acc4953d1d859a3ad0fe5d659e14761d1b8ee76f 100644 (file)
--- a/tests/cmake/test.c
+++ b/tests/cmake/test.c
@@ -21,7 +21,7 @@
  * SPDX-License-Identifier: curl
  *
  ***************************************************************************/
-#include "curl/curl.h"
+#include <curl/curl.h>
 #include <stdio.h>
 
 int main(int argc, const char **argv)