Add whitespace folding for some atomic data types that it's missing on.

Merged Damjan Jovanovic requested to merge dcodejams/libxml2:atomic-whitespace-folding into master

XSD validation fails when some atomic types contain surrounding whitespace even though XML Schema Part 2: Datatypes Second Edition, section 4.3.6 says they should be collapsed. Fix this.

(I am not sure whether the test is correct.)

Issue: #278 (closed)

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