Rename func to funk in tests to avoid Go keyword problems

Examples/test-suite/octave/null_pointer_runme.m

@@ -5,4 +5,4 @@ endif
 
 null_pointer;
 
-assert(func([]));
+assert(funk([]));

Examples/test-suite/octave/octave_cell_deref_runme.m

@@ -5,8 +5,8 @@ endif
 
 octave_cell_deref;
 
-assert(func("hello"));
-assert(func({"hello"}));
+assert(funk("hello"));
+assert(funk({"hello"}));
 
 c = func2();
 assert(strcmp(c{1}, "hello"));