20250130-UHAVE_FFDHE_2048

[douzzer]

tests/api.c and wolfcrypt/benchmark/benchmark.c: fixes for building with HAVE_FFDHE_3072 and/or HAVE_FFDHE_4096 but without HAVE_FFDHE_2048.

tested with

./configure --enable-all --with-eccminsz=256 --with-max-rsa-bits=8192 CFLAGS='-DRSA_MIN_SIZE=2048 -UHAVE_FFDHE_2048 -DHAVE_FFDHE_3072 -DHAVE_FFDHE_4096 -DHAVE_FFDHE_6144 -DHAVE_FFDHE_8192'

and same without DHE 3072:

`./configure --enable-all --with-eccminsz=256 --with-max-rsa-bits=8192 CFLAGS='-DRSA_MIN_SIZE=2048 -UHAVE_FFDHE_2048 -UHAVE_FFDHE_3072 -DHAVE_FFDHE_4096 -DHAVE_FFDHE_6144 -DHAVE_FFDHE_8192'`