So it seems to difficult the replace glibc by hand, as there is no response...
In the mean time I focussed my attention to Crosstool
and have succesfully build an ARM-Xscale Crosstool toolchain for gcc 3.5.4 and glibc 2.2.5. As the glibc library version of this toolchain is less of that on the Newisys NA-1400 (2.2.6), the resulting binaries should function just fine.
So problem not solved, but worked around. Thanks