Fix hiredis driver crashes

Somehow `ruby.h` must be included first, otherwise
the extension and the VM use different `fd_set` structs.

Co-Authored-By: Peter Zhu <peter@peterzhu.ca>

Author: byroot

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         os: ["ubuntu-latest"]
         redis: ["6.2"]
         ruby: ["3.1", "3.0", "2.7", "2.6", "2.5"]
-        driver: ["ruby"] #, "hiredis"]
+        driver: ["ruby", "hiredis"]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out code

ext/redis_client/hiredis/hiredis_connection.c

@@ -30,11 +30,11 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include "ruby.h"
 #include <errno.h>
 #include <sys/socket.h>
 #include "hiredis.h"
 #include "hiredis_ssl.h"
-#include "ruby.h"
 
 static VALUE rb_cSet, rb_eRedisClientCommandError, rb_eRedisClientConnectionError;
 static VALUE rb_eRedisClientConnectTimeoutError, rb_eRedisClientReadTimeoutError, rb_eRedisClientWriteTimeoutError;