Make big endians first class citizens again

Make big endians first class citizens again

No longer do the big iron on yore which lack SIMD optimized loads need
to search strings a byte at a time like primitive machines of the vax
era. This guard here was mostly due to the fact that the string
comparison was searched with "count trailing zero", which assumes an
endianness.  We can just conditionally use leading zeros when on big
endian and stop using the extremely naive C implementation. This makes
things a tad bit faster.