addr2line.c: this file has no portability

It seems nobody on earth is interested in such thing for it.
Ignore compiler warnings.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65159 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

addr2line.c

@@ -8,6 +8,12 @@
 
 **********************************************************************/
 
+#if defined(__clang__)
+#pragma clang diagnostic ignored "-Wpedantic"
+#elif defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wpedantic"
+#endif
+
 #include "ruby/config.h"
 #include "ruby/defines.h"
 #include "ruby/missing.h"