byteorder.h: Fix MSVC compiler error C2371

byteorder.h: Fix MSVC compiler error C2371

Compiling byteorder_test.c with VS2022 produces the following warnings
and errors:

E:\build\kiyolee\openssl\include\openssl\byteorder.h(24,21): warning
C4164: '_byteswap_ushort': intrinsic function not declared
(compiling source file '../../../test/byteorder_test.c')
E:\build\kiyolee\openssl\include\openssl\byteorder.h(25,21): warning
C4164: '_byteswap_ulong': intrinsic function not declared
(compiling source file '../../../test/byteorder_test.c')
E:\build\kiyolee\openssl\include\openssl\byteorder.h(26,21): warning
C4164: '_byteswap_uint64': intrinsic function not declared
(compiling source file '../../../test/byteorder_test.c')
E:\build\kiyolee\openssl\include\openssl\byteorder.h(112,18): warning
C4013: '_byteswap_ushort' undefined; assuming extern returning int
(compiling source file '../../../test/byteorder_test.c')
E:\build\kiyolee\openssl\include\openssl\byteorder.h(144,18): warning
C4013: '_byteswap_ulong' undefined; assuming extern returning int
(compiling source file '../../../test/byteorder_test.c')
E:\build\kiyolee\openssl\include\openssl\byteorder.h(182,18): warning
C4013: '_byteswap_uint64' undefined; assuming extern returning int
(compiling source file '../../../test/byteorder_test.c')
C:\Program Files (x86)\Windows
Kits\10\Include\10.0.22621.0\ucrt\stdlib.h(298,41): error C2371:
'_byteswap_ushort': redefinition; different basic types
(compiling source file '../../../test/byteorder_test.c')
C:\Program Files (x86)\Windows
Kits\10\Include\10.0.22621.0\ucrt\stdlib.h(299,41): warning C4142:
'_byteswap_ulong': benign redefinition of type
(compiling source file '../../../test/byteorder_test.c')
C:\Program Files (x86)\Windows
Kits\10\Include\10.0.22621.0\ucrt\stdlib.h(300,41): error C2371:
'_byteswap_uint64': redefinition; different basic types
(compiling source file '../../../test/byteorder_test.c')

CLA: trivial

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/26448)