Fix compilation of set proto calls

The setter functions were added in OpenSSL 1.1.0 [1]. The patch fixes
compilation for previous versions:

/usr/bin/ld: $WORK/b079/_x030.o: in function `X_SSL_CTX_set_min_proto_version':
./shim.c:479: undefined reference to `SSL_CTX_set_min_proto_version'
/usr/bin/ld: $WORK/b079/_x030.o: in function `X_SSL_CTX_set_max_proto_version':
./shim.c:483: undefined reference to `SSL_CTX_set_max_proto_version'

1. https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_min_proto_version.html

Author: oleg-jukovec

shim.c

@@ -476,11 +476,19 @@ int X_SSL_CTX_new_index() {
 }
 
 int X_SSL_CTX_set_min_proto_version(SSL_CTX *ctx, int version) {
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
 	return SSL_CTX_set_min_proto_version(ctx, version);
+#else
+	return 0;
+#endif
 }
 
 int X_SSL_CTX_set_max_proto_version(SSL_CTX *ctx, int version) {
+#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
 	return SSL_CTX_set_max_proto_version(ctx, version);
+#else
+	return 0;
+#endif
 }
 
 long X_SSL_CTX_set_options(SSL_CTX* ctx, long options) {