Lower-case the OS family before matching it against the family names (backport of #13152 to maven-4.0.x) - #13154

…pache#13152)

* Lower-case the OS family before matching it against the family names

The Maven 3 activator lower-cases activation/os/family before handing it
to Os.isFamily (0456c7c, "Caplital OS name can not activate profile"),
as it does for name and arch. The Maven 4 activator lower-cases name and
arch but passes family through untouched.

Os.isFamily switches on the family string against lower-case constants
such as "winnt", "unix" and "dos"; anything that does not match falls
through to the default branch, which is a plain
actualOsName.contains(family). Families whose name is a substring of the
OS name, like "Mac" on "mac os x", still work by accident, which is why
the existing capital-name test did not catch this. The ones that rely on
the switch do not: <family>WinNT</family> no longer activates on
Windows, and <family>Mac</family> no longer activates on a JDK reporting
os.name=darwin.

Add the toLowerCase call so the family follows the same rule as the
other three fields, and cover the two cases above.

* Add negation test for capitalised OS family

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Co-authored-by: Guillaume Nodet <gnodet@gmail.com>