[issue1473] Drop _EXPORTS macros in PCbuild9

[Christian Heimes]

Christian Heimes added the comment:

You are right. I've checked the header files of the dependencies or
simply tried what happens when I remove some defines. The only macro
existing macro is BZ2_EXPORT but that's defined unless BZ2_IMPORT is
defined.

What about the remaining defines? I've copied them from the old projects:
_USRDLL - unknown to me
WIN32 - ?, is it even safe to define it for x64?
_WINDOWS - ?
_WIN32 - ?
_CRT_SECURE_NO_DEPRECATE - required to get rid of a bunch of warnings

__________________________________
Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1473>
__________________________________