tofu: Compare squares instead of square roots.

* g10/Makefile.am (tofu_source) [USE_TOFU]: Remove sqrtu32.h and sqrtu32.c. * g10/sqrtu32.h, g10/sqrtu32.c: Removed files. * g10/tofu.c: Compare squares instead of square roots.

The original code is a factor 11.5 slower than using libm's sqrt(),

which in turn is a factor 3.5 slower than using one multiplication

on the other side of the comparison. Also, it's much simpler now.

- Signed-off-by: Marcus Brinkmann <mb@g10code.com>