Configurations/10-main.conf: add back /WX to VC-WIN32.

We had /WX (treat warnings as errors) in VC-WIN32 for long time. At
some point it was somehow omitted. It's argued that it allows to
keep better focus on new code, which motivates the comeback...
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4721)

Configurations/10-main.conf

@@ -1281,7 +1281,7 @@ sub vms_info {
         inherit_from     => [ "BASE_Windows" ],
         template         => 1,
         cc               => "cl",
-        cflags           => "-W3 -wd4090 -Gs0 -GF -Gy -nologo -DOPENSSL_SYS_WIN32 -DWIN32_LEAN_AND_MEAN -DL_ENDIAN -D_CRT_SECURE_NO_DEPRECATE",
+        cflags           => "-W3 -wd4090 -Gs0 -GF -Gy -nologo -DOPENSSL_SYS_WIN32 -DWIN32_LEAN_AND_MEAN -DL_ENDIAN -D_CRT_SECURE_NO_DEPRECATE -D_WINSOCK_DEPRECATED_NO_WARNINGS",
         defines          => add(sub { my @defs = ();
                                       unless ($disabled{"zlib-dynamic"}) {
                                           my $zlib =
@@ -1380,6 +1380,7 @@ sub vms_info {
         # configure with 'perl Configure VC-WIN32 -DUNICODE -D_UNICODE'
         inherit_from     => [ "VC-noCE-common", asm("x86_asm"),
                               sub { $disabled{shared} ? () : "uplink_common" } ],
+        cflags           => add("-WX"),
         as               => sub { vc_win32_info()->{as} },
         asflags          => sub { vc_win32_info()->{asflags} },
         asoutflag        => sub { vc_win32_info()->{asoutflag} },