[pipp] fix build on MinGW32 so work with GNU Make on Windows (and *nix), but not yet with nmake on Windows.
[pipp] fix build on MinGW32
so work with GNU Make on Windows (and *nix),
but not yet with nmake on Windows.

How writes for nmake the following Makefile sample ?
export MYVAR=this_var_must_be_seen_in_the_env_of_called_program
all:
	perl -e "print join qq{\n}, sort keys %ENV"


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@31543 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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