Integrate changes #9259,9260 from maintperl into mainline.

Integrate changes #9259,9260 from maintperl into mainline.

Subject: [MacPerl-Porters] [PATCH] POSIX, File::Path (Mac OS) for 5.6.1 and 5.7

Subject: [PATCH perl-5.6.1-TRIAL3/run.c] printf warning

p4raw-link: @9260 on //depot/maint-5.6/perl: b83ee361c1b8f0045f0125bffa546780643848c4
p4raw-link: @9259 on //depot/maint-5.6/perl: 5a271d91b72f558a378756b049d1040c9ff0a63c

p4raw-id: //depot/perl@9261
p4raw-integrated: from //depot/maint-5.6/perl@9258 'copy in'
	lib/File/Path.pm (@8175..) 'merge in' ext/POSIX/POSIX.xs
	(@8885..) run.c (@8987..)