This fixes potential crashes when this static object is accessed from
the constructors of other objects with static storage duration.
A concrete example of this could be seen when running the following on
Linux:
static inline const Typeface::Ptr face =
Typeface::createSystemTypefaceFor (...);
Here, 'face' is a static data member of some class. Creating a system
typeface on Linux will parse an XML document of system typefaces,
eventually accessing juce_xmltextContentAttributeName.
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