Portability

- Applied patch from Emil Sköldberg.

Replace 'test ... == ...' with 'test ... = ...',
since [quoted from pkgsrc error message]:

The "test" command, as well as the "[" command, are not required to know
the "==" operator. Only a few implementations like bash and some
versions of ksh support it.

When you run "test foo == foo" on a platform that does not support the
"==" operator, the result will be "false" instead of "true". This can
lead to unexpected behavior.

AUTHORS

@@ -20,6 +20,7 @@ The following submitted code, packages or analysis, and deserve special thanks:
   Steven de Brouwer
   Pietro Cerutti
   Alexander Neumann
+  Emil Sköldberg
 
 Thanks to the following, who submitted detailed bug reports and excellent suggestions:
   Eugene Kramer