ex_libs settings have to be added to, not overriden, on Windows too

Reviewed-by: NMatt Caswell <matt@openssl.org>

Configurations/10-main.conf

@@ -1298,20 +1298,20 @@ sub vms_info {
                                        release => sub { $disabled{shared} ? "/MT" : () },
                                       )),
         bin_lflags       => add("/subsystem:console /opt:ref"),
-        ex_libs          => sub {
+        ex_libs          => add(sub {
             my @ex_libs = ();
             push @ex_libs, 'ws2_32.lib' unless $disabled{sock};
             push @ex_libs, 'gdi32.lib advapi32.lib crypt32.lib user32.lib';
             return join(" ", @ex_libs);
-        },
+        }),
     },
     "VC-WIN64-common" => {
         inherit_from     => [ "VC-noCE-common" ],
-        ex_libs          => sub {
+        ex_libs          => add(sub {
             my @ex_libs = ();
             push @ex_libs, 'bufferoverflowu.lib' if (`cl 2>&1` =~ /14\.00\.4[0-9]{4}\./);
             return join(" ", @_, @ex_libs);
-        },
+        }),
         bn_ops           => "SIXTY_FOUR_BIT EXPORT_VAR_AS_FN",
         build_scheme     => add("VC-W64", { separator => undef }),
     },
@@ -1349,14 +1349,14 @@ sub vms_info {
                                   return $ver ge $vew ? "nasm" : "nasmw" },
         asflags          => "-f win32",
         asoutflag        => "-o",
-        ex_libs          => sub {
+        ex_libs          => add(sub {
             my @ex_libs = ();
             # WIN32 UNICODE build gets linked with unicows.lib for
             # backward compatibility with Win9x.
             push @ex_libs, 'unicows.lib'
                 if (grep { $_ eq "UNICODE" } @user_defines);
             return join(" ", @ex_libs, @_);
-        },
+        }),
         sys_id           => "WIN32",
         bn_ops           => "BN_LLONG EXPORT_VAR_AS_FN",
         perlasm_scheme   => "win32n",
@@ -1387,7 +1387,7 @@ sub vms_info {
                                               ? "/entry:mainCRTstartup" : (); }),
         sys_id           => "WINCE",
         bn_ops           => "BN_LLONG EXPORT_VAR_AS_FN",
-        ex_libs          => sub {
+        ex_libs          => add(sub {
             my @ex_libs = ();
             push @ex_libs, 'ws2.lib' unless $disabled{sock};
             push @ex_libs, 'crypt32.lib';
@@ -1405,7 +1405,7 @@ sub vms_info {
             push @ex_libs, ' /nodefaultlib coredll.lib corelibc.lib'
                 if ($ENV{'TARGETCPU'} eq "X86");
             return @ex_libs;
-        },
+        }),
         build_scheme     => add("VC-WCE", { separator => undef }),
     },