[builtins] Avoid using long double in FreeBSD standalone environment (#76175)

After 05a4212c a number of long double related declarations are
enabled in `int_types.h`, whenever the CPU architecture and platform
support it. However, this does not work with FreeBSD's standalone
environment, which disallows any use of floating point.

In add98b24 this was made conditional with `CRT_HAS_FLOATING_POINT`,
so extend the block guarded by that define to include all floating point
related declarations.