- export required symbol

This commit was SVN r14536.

ompi/mca/btl/base/btl_base_error.h

@@ -103,7 +103,7 @@ do {                                                         \
 extern "C" {
 #endif
 
-extern void mca_btl_base_error_no_nics(const char* transport, 
+OMPI_DECLSPEC extern void mca_btl_base_error_no_nics(const char* transport, 
                                                      const char* nic_name);
 
 #if defined(c_plusplus) || defined(__cplusplus)