CryptoPkg: Fix OpenSSL BN wordsize and OPENSSL_SYS_UEFI handling

We were manually setting -DSIXTY_FOUR_BIT_LONG or -DTHIRTY_TWO_BIT on
the compiler command line when building OpensslLib itself, but not when
building BaseCryptLib.

But when building BaseCryptLib, we weren't setting OPENSSL_SYS_UEFI
*either*. This meant that *that* build was picking up the definition
from <openssl/opensslconf.h>, and was thus *different* to the version
the library was built with, in some cases.

So set OPENSSL_SYS_UEFI consistently in OpensslSupport.h and *also*
define either SIXTY_FOUR_BIT or THIRTY_TWO_BIT there too.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Qin Long <qin.long@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18706 6f19259b-4bc3-4df7-8a09-765794883524

CryptoPkg/Include/OpenSslSupport.h

@@ -23,6 +23,31 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #define MAX_STRING_SIZE  0x1000
 
+//
+// OpenSSL relies on explicit configuration for word size in crypto/bn,
+// but we want it to be automatically inferred from the target. So we
+// bypass what's in <openssl/opensslconf.h> for OPENSSL_SYS_UEFI, and
+// define our own here.
+//
+#ifdef CONFIG_HEADER_BN_H
+#error CONFIG_HEADER_BN_H already defined
+#endif
+
+#define CONFIG_HEADER_BN_H
+
+#if defined(MDE_CPU_X64) || defined(MDE_CPU_AARCH64) || defined(MDE_CPU_IA64)
+//
+// With GCC we would normally use SIXTY_FOUR_BIT_LONG, but MSVC needs
+// SIXTY_FOUR_BIT, because 'long' is 32-bit and only 'long long' is
+// 64-bit. Since using 'long long' works fine on GCC too, just do that.
+//
+#define SIXTY_FOUR_BIT
+#elif defined(MDE_CPU_IA32) || defined(MDE_CPU_ARM) || defined(MDE_CPU_EBC)
+#define THIRTY_TWO_BIT
+#else
+#error Unknown target architecture
+#endif
+
 //
 // File operations are not required for building Open SSL, 
 // so FILE is mapped to VOID * to pass build