s/.exists/blibdirs/ is a bit broken

[Stas Bekman]

EU::MM 6.21, coming with perl 5.8.3 has a problem with the move from .exists 
to blibdirs. For example under mod_perl 2.0 dynamic_lib target reruns several 
of its dependant targets each time 'make' is invoked, even though nothing has 
changed. This is broken.

I believe the problem is in substituting several independent .exists targets 
with a single blibdirs target. Though I haven't investigated the exact 
details, you should be able to reproduce the problem with any CPAN module 
building dynamic extensions, I've just tested with DBI-1.39, every time I run 
make it runs:

Running Mkbootstrap for DBI ()
chmod 644 DBI.bs
rm -f blib/arch/auto/DBI/DBI.so
LD_RUN_PATH="" cc  -shared -L/usr/local/lib DBI.o  -o blib/arch/auto/DBI/DBI.so
chmod 755 blib/arch/auto/DBI/DBI.so
cp DBI.bs blib/arch/auto/DBI/DBI.bs
chmod 644 blib/arch/auto/DBI/DBI.bs
cp dbiprof blib/script/dbiprof
/home/stas/perl/5.8.3-ithread/bin/perl5.8.2 "-MExtUtils::MY" -e 
"MY->fixin(shift)" blib/script/dbiprof
cp dbiproxy blib/script/dbiproxy
/home/stas/perl/5.8.3-ithread/bin/perl5.8.2 "-MExtUtils::MY" -e 
"MY->fixin(shift)" blib/script/dbiproxy



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