Yep, I have them too and I don't have any other version of perl installed other than the Cygwin one:

$ perl -V
Summary of my perl5 (revision 5 version 10 subversion 1) configuration
+:
   
  Platform:
    osname=cygwin, osvers=1.7.5(0.22553), archname=i686-cygwin-thread-
+multi-64int
    uname='cygwin_nt-5.1 reini 1.7.5(0.22553) 2010-04-12 19:07 i686 cy
+gwin '
  Built under cygwin
  Compiled at Aug 28 2010 20:17:29
  %ENV:
    CYGWIN=""
  @INC:
    /usr/lib/perl5/5.10/i686-cygwin
    /usr/lib/perl5/5.10
    /usr/lib/perl5/site_perl/5.10/i686-cygwin
    /usr/lib/perl5/site_perl/5.10
    /usr/lib/perl5/vendor_perl/5.10/i686-cygwin
    /usr/lib/perl5/vendor_perl/5.10
    /usr/lib/perl5/vendor_perl/5.10
    /usr/lib/perl5/site_perl/5.8
    /usr/lib/perl5/vendor_perl/5.8
    .
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