msvc: update bitcoin_config.h defines

[fanquake]

While not many of these are used, some, like HAVE_DLLEXPORT_ATTRIBUTE, are used when creating libbitcoinconsensus.

Given this file is static, also just remove everything that is commented out.

[sipsorcery]

tACK.

Builds fine for me on Windows 10.

I was also unable to find any reference to the defines below in the source code when doing a Windows build. I was able to build with them removed.

LT_OBJDIR
PACKAGE_STRING
PACKAGE_TARNAME

#if defined AC_APPLE_UNIVERSAL_BUILD
# if defined __BIG_ENDIAN__
#  define WORDS_BIGENDIAN 1
# endif
#else
# ifndef WORDS_BIGENDIAN
/* #  undef WORDS_BIGENDIAN */
# endif
#endif

_FILE_OFFSET_BITS
STDC_HEADERS

[fanquake]

@sipsorcery thanks. Added some more removals.

[sipsorcery]

tACK ae4ad1a.