1.5.12: find with -iregex is case-sensitive

[johnwrussell@comcast.net]

Even with the -iregex option, the find command performs case-sensitive
matching. 

Test procedure:

$ mkdir test
$ touch test/file-a
$ touch test/File-b
$ find test | grep -i ".*file.*"
test/file-a
test/File-b

$ find test -iregex ".*file.*"
test/file-a

$ find test -iregex ".*File.*"
test/File-b

I'm using Cygwin 1.5.12-1 under Windows XP Professional Ver 5.1 Build 2600
Service Pack 1, findutils 20041227-1.

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