BUILD: ssl: make BoringSSL use its own version numbers

BoringSSL is a fork of OpenSSL 1.1.0, however in
49e9f67d8b7cbeb3953b5548ad1009d15947a523 it has changed version to 1.1.1.

Should fix issue #895.

This must be backported to 2.2, 2.1, 2.0, 1.8
diff --git a/include/haproxy/openssl-compat.h b/include/haproxy/openssl-compat.h
index acdc9c5..d9affa2 100644
--- a/include/haproxy/openssl-compat.h
+++ b/include/haproxy/openssl-compat.h
@@ -31,6 +31,12 @@
  * extra features with ORs and not with AND NOT.
  */
 #define HA_OPENSSL_VERSION_NUMBER 0x1000107fL
+#elif defined(OPENSSL_IS_BORINGSSL)
+/*
+ * in 49e9f67d8b7cbeb3953b5548ad1009d15947a523 BoringSSL has changed its version to 1.1.1
+ * Let's switch it back to 1.1.0
+ */
+#define HA_OPENSSL_VERSION_NUMBER 0x1010007f
 #else /* this is for a real OpenSSL or a truly compatible derivative */
 #define HA_OPENSSL_VERSION_NUMBER OPENSSL_VERSION_NUMBER
 #endif