Some versions of ole32 don't test that the lindex field of the
FORMATETC structure passed into functions is valid.

As a window being registered for drag and drop is a system-global
property, the tests could be affected by other processes in the
system.

This fixes a hang (and sometimes a system hang) on MacOSX when running
the inetmib1 tests.  Spotted by Owen Rudge.

The value of *called is set asynchronously and so the callback
function could be called after IInternetProtocol_Read returns
E_PENDING. The value of *called is only predictable after the
WaitForSingleObject call returns. Therefore, remove the checks on
*called before this call.

msvcmaker: Define _USE_MATH_DEFINES so that M_PI and other constants are defined when including <math.h>.

Also don't generate a custom build step for the .spec file for static
libraries, since they don't have a .spec file.

The include project generates .h files from .idl files so that they
can be used when compiling the modules.

Remove all functions for which the HAVE_ define is not used anywhere.

Add _strdup, _strtoi64 _strtoui64, chsize, strdup and vsnprintf which
are all present in MSVC headers.

These defines aren't needed. Move the X_DISPLAY_MISSING and __ASM_*
defines to after the PACKAGE_* defines to match config.h.in.

Update list of headers present in the MSVC build environment. fcntl.h
isn't detected by configure and so isn't needed.