strtod: fix clash with strtold Problem reported for RHEL 5 by Jesse Caldwell (Bug#34817). * lib/strtod.c (compute_minus_zero, minus_zero): Simplify by remving the macro / external variable, and having just a function. User changed. This avoids the need for an external variable that might clash.

# Suppress a valgrind message about use of uninitialized memory in rawmemchr().
# This use is OK because it provides only a speedup.
{
    rawmemchr-value4
    Memcheck:Value4
    fun:rawmemchr
}
{
    rawmemchr-value8
    Memcheck:Value8
    fun:rawmemchr
}