Win32CORE.c is shipped as a C file, not built by ExtUtils::ParseXS, so needs
to be manually updated to reflect the change of default in XSUB.h
+XS_EXTERNAL(boot_Win32CORE)
{
/* This function only exists because writemain.SH, lib/ExtUtils/Embed.pm
* and win32/buildext.pl will all generate references to it. The function
{
/* This function only exists because writemain.SH, lib/ExtUtils/Embed.pm
* and win32/buildext.pl will all generate references to it. The function