Provide generous estimates of the sizes of EVP_MD_CTX and EVP_CIPHER_CTX.
(In OpenBSD 7.0 amd64 and sparc64 they are 48 and 168, respectively).
Also provide EVP_MD_CTX_init and EVP_CIPHER_CTX_init because someone
decided it was a good idea to do this.

Index: include/ssl_compat.h
--- include/ssl_compat.h.orig
+++ include/ssl_compat.h
@@ -62,6 +62,13 @@
 #endif /* HAVE_OPENSSL11 */
 #endif
 
+#ifdef LIBRESSL_VERSION_NUMBER
+#define EVP_MD_CTX_SIZE			64
+#define EVP_CIPHER_CTX_SIZE             192
+#define EVP_MD_CTX_init(X) do { memset((X), 0, EVP_MD_CTX_SIZE); EVP_MD_CTX_reset(X); } while(0)
+#define EVP_CIPHER_CTX_init(X) do { memset((X), 0, EVP_CIPHER_CTX_SIZE); EVP_CIPHER_CTX_reset(X); } while(0)
+#else
+
 #ifdef HAVE_WOLFSSL
 #define EVP_MD_CTX_SIZE                 sizeof(wc_Md5)
 #endif
@@ -87,6 +94,7 @@
 #define EVP_CIPHER_CTX_reset(X) EVP_CIPHER_CTX_cleanup(X)
 #define X509_get0_notBefore(X) X509_get_notBefore(X)
 #define X509_get0_notAfter(X) X509_get_notAfter(X)
+#endif
 #endif
 #endif