ignore symbols introduced by gcov in test_exported_symbols

tests/test_exported_symbols.in

@@ -44,6 +44,8 @@ if [ x"$lt_cv_nm_interface" = x"BSD nm" ]; then
 /^${exp_sym_prefix}.*\\\$.*/b
 # skip internal symbols for stubs created by xlf
 /^${exp_sym_prefix}.*\\\*__xt.*/b
+# skip symboles introduced by gcov
+/^${exp_sym_prefix}__gcov_*/b
 p
 }")
   if [ -n "$badsyms" ]; then