[clang][Fuchsia] Use unsigned int for wint_t on *-fuchsia targets (#95499)

This aligns Fuchsia targets with other similar OS targets such as
Linux.  Fuchsia's libc already uses unsigned rather than the
compiler-provided __WINT_TYPE__ macro for its wint_t typedef, so
this just makes the compiler consistent with the OS's actual ABI.
The only known manifestation of the mismatch is -Wformat warnings
for %lc no matching wint_t arguments.

The closest thing I could see to existing tests for each target's
wint_t type setting was the predefine tests that check various
macros including __WINT_TYPE__ on a per-machine and/or per-OS
basis.  While the setting is done per-OS in most of the target
implementations rather than actually varying by machine, the only
existing tests for __WINT_TYPE__ are in per-machine checks that
are also wholly or partly tagged as per-OS.  x86_64 and riscv64
tests for respective *-linux-gnu targets now check for the same
definitions in the respective *-fuchsia targets.  __WINT_TYPE__
is not among the type checked in the aarch64 tests and those lack
a section that's specifically tested for aarch64-linux-gnu; if
such is added then it can similarly be made to check for most or
all of the same value on aarch64-fuchsia as aarch64-linux-gnu.
But since the actual implementation of choosing the type is done
per-OS and not per-machine for the three machines with Fuchsia
target support, the x86 and riscv64 tests are already redundantly
testing that same code and seem sufficient.

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