Add maskHash to RSA_PSS_PARAMS for compat

This CL adds a maskHash member to the rsa_pss_params_st struct for
increased compatibility with OpenSSL: https://source.chromium.org/chromium/chromium/src/+/main:third_party/perl/c/include/openssl/rsa.h;l=282-289

Node.js recently began to make use of this member in https://github.com/nodejs/node/pull/39851
and without this member Electron sees compilation errors.

Change-Id: Ibd18a31605b0a715edb279a3bca4b4f05e679767
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/49365
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/include/openssl/rsa.h b/include/openssl/rsa.h
index 27bc7bf..95a478a 100644
--- a/include/openssl/rsa.h
+++ b/include/openssl/rsa.h
@@ -684,6 +684,11 @@
 // on success or zero otherwise.
 OPENSSL_EXPORT int RSA_print(BIO *bio, const RSA *rsa, int indent);
 
+// RSA_get0_pss_params returns NULL. In OpenSSL, this function retries RSA-PSS
+// parameters associated with |RSA| objects, but BoringSSL does not support
+// the id-RSASSA-PSS key encoding.
+OPENSSL_EXPORT const RSA_PSS_PARAMS *RSA_get0_pss_params(const RSA *rsa);
+
 
 struct rsa_meth_st {
   struct openssl_method_common_st common;