[Bug libstdc++/101234] Two tests require en_US.ISO-8859-15 but glibc no longer installs that by default.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101234

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like the testsuite is incorrect, it should have been 'en_US.ISO8859-15'