Fix up typo that's been copied around in several places.
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4332 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/common/os/tls.h b/common/os/tls.h
index 8980197..f6b5550 100644
--- a/common/os/tls.h
+++ b/common/os/tls.h
@@ -33,7 +33,7 @@
#ifndef HAVE_GNUTLS_DATUM_T
typedef gnutls_datum gnutls_datum_t;
#endif
-#ifndef HAVE_GNUTLS_CRT_T
+#ifndef HAVE_GNUTLS_X509_CRT_T
typedef gnutls_x509_crt gnutls_x509_crt_t;
#endif
#ifndef HAVE_GNUTLS_PK_ALGORITHM_T