Modernise the mingw cflags and ldflags

Reviewed-by: NRich Salz <rsalz@openssl.org>

Configurations/10-main.conf

@@ -1162,7 +1162,7 @@
     "mingw" => {
         inherit_from     => [ asm("x86_asm") ],
         cc               => "gcc",
-        cflags           => "-mno-cygwin -DL_ENDIAN -DWIN32_LEAN_AND_MEAN -march=i486 -Wall",
+        cflags           => "-DL_ENDIAN -DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE -m32 -Wall",
         debug_cflags     => "-g -O0",
         release_cflags   => "-O3 -fomit-frame-pointer",
         thread_cflag     => "-D_MT",
@@ -1173,7 +1173,7 @@
         dso_scheme       => "win32",
         shared_target    => "cygwin-shared",
         shared_cflag     => "-D_WINDLL -DOPENSSL_USE_APPLINK",
-        shared_ldflag    => "-mno-cygwin",
+        shared_ldflag    => "-static-libgcc",
         shared_extension => ".dll",
     },
     "mingw64" => {
@@ -1187,7 +1187,7 @@
         # Applink is never engaged and can as well be omitted.
         inherit_from     => [ asm("x86_64_asm") ],
         cc               => "gcc",
-        cflags           => "-mno-cygwin -DL_ENDIAN -Wall -DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE",
+        cflags           => "-DL_ENDIAN -DWIN32_LEAN_AND_MEAN -DUNICODE -D_UNICODE -m64 -Wall",
         debug_cflags     => "-g -O0",
         release_cflags   => "-O3",
         thread_cflag     => "-D_MT",
@@ -1198,7 +1198,7 @@
         dso_scheme       => "win32",
         shared_target    => "cygwin-shared",
         shared_cflag     => "-D_WINDLL",
-        shared_ldflag    => "-mno-cygwin",
+        shared_ldflag    => "-static-libgcc",
         shared_extension => ".dll",
     },
 

Configure

@@ -870,10 +870,10 @@ push @{$config{defines}},
     map { (my $x = $_) =~ s/^OPENSSL_NO_/OPENSSL_EXPERIMENTAL_/; $x }
         @{$config{openssl_experimental_defines}};
 
-if ($target =~ /^mingw/ && `$target{cc} --target-help 2>&1` !~ m/-mno-cygwin/m)
+if ($target =~ /^mingw/ && `$target{cc} --target-help 2>&1` =~ m/-mno-cygwin/m)
 	{
-	$config{cflags} =~ s/-mno-cygwin\s*//;
-	$target{shared_ldflag} =~ s/-mno-cygwin\s*//;
+	$config{cflags} .= " -mno-cygwin";
+	$target{shared_ldflag} .= " -mno-cygwin";
 	}
 
 if ($target =~ /linux.*-mips/ && !$no_asm && $user_cflags !~ /-m(ips|arch=)/) {