... when targeting C.
library/string.m:
On 27 Oct 2021, Julien sped up one of these operations
by avoiding the use of sprintf. Apply the same technique,
suitably generalized, to all other similar operations.
Use macros to reduce the amount of code duplication needed.
runtime/mercury_conf.h.in:
Fix an old bug: spell MR_MERCURY_IS_{32,64}_BITS correctly,
to match the name that is (conditionally) defined by configure.
configure.ac:
Delete references to MERCURY_IS_{32,64}_BITS, which turn out
to be totally unused.
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