Remove the -rename option in the Go language support. Do a much

better job of checking for name conflicts.  Ignore conflicting names
with a warning.  Adjust the testsuite accordingly.


git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@12135 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/preproc.i

@@ -7,6 +7,8 @@
 %warnfilter(SWIGWARN_RUBY_WRONG_NAME) __GMP_HAVE_PROTOTYPES; /* Ruby, wrong constant name */
 %warnfilter(SWIGWARN_RUBY_WRONG_NAME) __GMP_HAVE_TOKEN_PASTE; /* Ruby, wrong constant name */
 
+#pragma SWIG nowarn=890                                      /* lots of Go name conflicts */
+
 /* check __cplusplus case */
 %header
 %{