e_os.h: Include wspiapi.h to improve Windows backward compatibility

CLA: trivial

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/14550)

1 files changed, 1 insertions, 0 deletions

diff --git a/e_os.h b/e_os.h
index d8bf78c094..b19c4829de 100644
--- a/e_os.h
+++ b/e_os.h
@@ -108,6 +108,7 @@
         */
 #    include <winsock2.h>
 #    include <ws2tcpip.h>
+#    include <wspiapi.h>
        /* yes, they have to be #included prior to <windows.h> */
 #   endif
 #   include <windows.h>