[build] - fix build on MinGW32 (broken since r18660): static is not compatible with PARROT_API src\nci_test.c:270: error: external linkage required for symbol 'call_back' because of 'dllexport' attribute.
[build]
- fix build on MinGW32 (broken since r18660): static is not compatible with PARROT_API
src\nci_test.c:270: error: external linkage required for symbol 'call_back' because of 'dllexport' attribute.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@18672 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

FROGGS/parrot,tewk/parrot-select,youprofit/parrot,tewk/parrot-select,youprofit/parrot,youprofit/parrot,fernandobrito/parrot,FROGGS/parrot,parrot/parrot,gitster/parrot,tkob/parrot,parrot/parrot,youprofit/parrot,gitster/parrot,parrot/parrot,fernandobrito/parrot,youprofit/parrot,youprofit/parrot,youprofit/parrot,tewk/parrot-select,fernandobrito/parrot,FROGGS/parrot,FROGGS/parrot,gagern/parrot,FROGGS/parrot,tewk/parrot-select,FROGGS/parrot,FROGGS/parrot,gagern/parrot,tkob/parrot,fernandobrito/parrot,tkob/parrot,tewk/parrot-select,tkob/parrot,gagern/parrot,fernandobrito/parrot,gagern/parrot,tkob/parrot,parrot/parrot,gitster/parrot,gitster/parrot,gitster/parrot,gagern/parrot,tkob/parrot,tewk/parrot-select,parrot/parrot,fernandobrito/parrot,tkob/parrot,FROGGS/parrot,tewk/parrot-select,gagern/parrot,tkob/parrot,youprofit/parrot,gitster/parrot,gagern/parrot,fernandobrito/parrot,gitster/parrot