Import Wycheproof's size-specific RSA PKCS#1 verifying tests.

It's unclear to me whether the normal rsa_signature_test.txt file is
still needed with these, but I've left it in for now.

Change-Id: I6db9c9556820263c2b0bc37d144e6403b9a7a178
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/39189
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/sources.cmake b/sources.cmake
index 8275233..657ca99 100644
--- a/sources.cmake
+++ b/sources.cmake
@@ -101,6 +101,15 @@
   third_party/wycheproof_testvectors/rsa_pss_4096_sha256_mgf1_32_test.txt
   third_party/wycheproof_testvectors/rsa_pss_4096_sha512_mgf1_32_test.txt
   third_party/wycheproof_testvectors/rsa_pss_misc_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_2048_sha224_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_2048_sha256_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_2048_sha384_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_2048_sha512_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_3072_sha256_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_3072_sha384_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_3072_sha512_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_4096_sha384_test.txt
+  third_party/wycheproof_testvectors/rsa_signature_4096_sha512_test.txt
   third_party/wycheproof_testvectors/rsa_signature_test.txt
   third_party/wycheproof_testvectors/x25519_test.txt
   third_party/wycheproof_testvectors/xchacha20_poly1305_test.txt