* testsuite/rsa-encrypt-test.c: Include rsa.h only if WITH_PUBLIC_KEY.
* testsuite/pkcs1-test.c: Include pkcs1.h only if WITH_PUBLIC_KEY.

Rev: src/nettle/testsuite/pkcs1-test.c:1.2
Rev: src/nettle/testsuite/rsa-encrypt-test.c:1.4
Rev: src/nettle/testsuite/sexp-format-test.c:1.8

* testsuite/rsa-encrypt-test.c (test_main): Likewise.
* testsuite/bignum-test.c (test_bignum): Likewise.

Rev: src/nettle/testsuite/bignum-test.c:1.4
Rev: src/nettle/testsuite/rsa-encrypt-test.c:1.3
Rev: src/nettle/testsuite/yarrow-test.c:1.14

as it seems it's only available with the newer gmp. Use
mpz_out_str instead.

Rev: src/nettle/testsuite/rsa-encrypt-test.c:1.2

Rev: src/nettle/testsuite/md2-test.c:1.1
Rev: src/nettle/testsuite/md4-test.c:1.1
Rev: src/nettle/testsuite/rsa-encrypt-test.c:1.1