Silence some unit test warnings

Author: sethrj

Examples/test-suite/abstract_signature.i

@@ -2,6 +2,7 @@
 
 %warnfilter(SWIGWARN_RUBY_WRONG_NAME) abstract_foo;	// Ruby, wrong class name
 %warnfilter(SWIGWARN_RUBY_WRONG_NAME) abstract_bar;	// Ruby, wrong class name
+%warnfilter(SWIGWARN_LANG_OVERLOAD_SHADOW) meth; // Fortran prevents overloaded methods from overriding a base class non-overloaded method
 
 %inline %{ 
 class abstract_foo 

Examples/test-suite/constant_directive.i

@@ -4,6 +4,9 @@
 
 #ifdef SWIGOCAML
 %warnfilter(SWIGWARN_PARSE_KEYWORD) val;
+#elif SWIGFORTRAN
+// Can't natively wrap function pointers with nonnative return type
+%warnfilter(SWIGWARN_LANG_NATIVE_UNIMPL,SWIGWARN_TYPEMAP_UNDEF) TYPE1FPTR1_CONSTANT1;
 #endif
 
 %inline %{