cuda.core: LinkerOptions passes true/false to nvJitLink backend, which only accepts 0/1 #3254

LinkerOptions._prepare_nvjitlink_options() passes Python-style true/false
(and raw "True"/"False" for -split-compile / -split-compile-extended)
to the nvJitLink backend for boolean options (-ftz, -prec-div,
-prec-sqrt, -fma, -split-compile, -split-compile-extended).

nvJitLink only accepts 0/1 for these options. It silently ignores the
invalid true/false values, so the option appears to be set successfully
but causes incorrect behavior / errors at runtime.

Reported in nvbug 6621758. Fix in #3128.