Merge pull request #3285 from olesalscheider/libressl

Fix build with LibreSSL

src/borg/crypto/_crypto_helpers.c

@@ -4,7 +4,7 @@
 #include <openssl/opensslv.h>
 #include <openssl/hmac.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 
 HMAC_CTX *HMAC_CTX_new(void)
 {

src/borg/crypto/_crypto_helpers.h

@@ -4,7 +4,7 @@
 #include <openssl/hmac.h>
 #include <openssl/evp.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 
 HMAC_CTX *HMAC_CTX_new(void);
 void HMAC_CTX_free(HMAC_CTX *ctx);