Adapt alpha_assert fix to recent Tru64 UNIX V5.1

[Rainer Orth]

Hi Bruce,

> This won't be what you expect.  Single quoted strings won't get "cooked".
> So, the characters skipped will be spaces and quoted 't'-s.

doh: I keep forgetting about that.

> So, use one of the following:
>> +    select    = '(# *define assert\(EX\).*)\(\(int\) \(EX\)\)';
>> +    select    = "(#[ \t]*" 'define assert\(EX\).*)\(\(int\) \(EX\)\)';

I've used the second variant.  Committed after retesting.

Thanks.
	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University