Replace "SSLeay" in API with OpenSSL

All instances of SSLeay (any combination of case) were replaced with
the case-equivalent OpenSSL.

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/crypto/rsa/rsa_eay.c b/crypto/rsa/rsa_eay.c
index 837e915..a41964d 100644
--- a/crypto/rsa/rsa_eay.c
+++ b/crypto/rsa/rsa_eay.c
@@ -146,7 +146,7 @@
     NULL                        /* rsa_keygen */
 };
 
-const RSA_METHOD *RSA_PKCS1_SSLeay(void)
+const RSA_METHOD *RSA_PKCS1_OpenSSL(void)
 {
     return (&rsa_pkcs1_eay_meth);
 }