Integrate changes #9706,9707 from maintperl into mainline.

Integrate changes #9706,9707 from maintperl into mainline.

change#7210 broke .packlist generation

ExtUtils::Installed doesn't quote regex metacharacters in paths
before using them in match; also make it work for dosish platforms

p4raw-link: @9707 on //depot/maint-5.6/perl: db42da4c9800ba185697f6472eccf880cdf1ccee
p4raw-link: @9706 on //depot/maint-5.6/perl: cb820f7234868a6a8a82c3314f11a1c3d25756a4
p4raw-link: @7210 on //depot/perl: a9d83807f0f0b611a2eea3bda7bb80eac9d5b104

p4raw-id: //depot/perl@9709
p4raw-integrated: from //depot/maint-5.6/perl@9708 'copy in'
	lib/ExtUtils/Install.pm (@8642..) 'merge in'
	lib/ExtUtils/Installed.pm (@5902..)