mail/libvmime: Fix build with GSASL 2.0.0

mail/libvmime/files/patch-src_vmime_security_sasl_SASLContext.cpp

+--- src/vmime/security/sasl/SASLContext.cpp.orig	2017-01-03 20:00:08 UTC
++++ src/vmime/security/sasl/SASLContext.cpp
+@@ -189,8 +189,6 @@ const string SASLContext::getErrorMessage(const string
+ 	ERROR(GSASL_GSSAPI_ACQUIRE_CRED_ERROR)
+ 	ERROR(GSASL_GSSAPI_DISPLAY_NAME_ERROR)
+ 	ERROR(GSASL_GSSAPI_UNSUPPORTED_PROTECTION_ERROR)
+-	ERROR(GSASL_KERBEROS_V5_INIT_ERROR)
+-	ERROR(GSASL_KERBEROS_V5_INTERNAL_ERROR)
+ 	ERROR(GSASL_SECURID_SERVER_NEED_ADDITIONAL_PASSCODE)
+ 	ERROR(GSASL_SECURID_SERVER_NEED_NEW_PIN)
+