I'm sorry, I can't build those packages. There is no explicit dependency on libc6 2.7 in the packages, it comes implicitely from the build system. If there is a way to manipulate this implicit dependency, then I don't know it. The alternative would be to actually build the packages on a Debian version that still had glibc <= 2.5. This would mean to use Etch, but the armel architecture didn't appear in Debian until Lenny, which already had glibc 2.7.