Revision 1503135

Fix the problem of "-laprutil-1" not being found when running xs/APR/APR/Makefile.PL on Windows

The Apache2::Build module provides apache_libs() which locates this library (and others, which the linker will quietly ignore if not required) for Windows and Cygwin so use that, inspired by what is done in ModPerl::BuildMM::WriteMakefile().

Perhaps implementing apache_libs() on other OSes would resolve the FIXME regarding other OSes in xs/APR/APR/Makefile.PL?