Add OPENSSL_EXPORT to BN_mod_inverse_blinded

Change-Id: Ie7543047c6f489ae849b3c27703948f0977c33fd
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/57905
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>

include/openssl/bn.h

diff --git a/include/openssl/bn.h b/include/openssl/bn.h
index 1fa499c..a03e41f 100644
--- a/include/openssl/bn.h
+++ b/include/openssl/bn.h
@@ -834,8 +834,9 @@
 // Note this function may incorrectly report |a| has no inverse if the random
 // blinding value has no inverse. It should only be used when |n| has few
 // non-invertible elements, such as an RSA modulus.
-int BN_mod_inverse_blinded(BIGNUM *out, int *out_no_inverse, const BIGNUM *a,
-                           const BN_MONT_CTX *mont, BN_CTX *ctx);
+OPENSSL_EXPORT int BN_mod_inverse_blinded(BIGNUM *out, int *out_no_inverse,
+                                          const BIGNUM *a,
+                                          const BN_MONT_CTX *mont, BN_CTX *ctx);
 
 // BN_mod_inverse_odd sets |out| equal to |a|^-1, mod |n|. |a| must be
 // non-negative and must be less than |n|. |n| must be odd. This function