Remove usage of reflection in TrueTypeUtil.java

[andreasrosdal]

Remove usage of reflection in TrueTypeUtil.java

https://github.com/LibrePDF/OpenPDF/blob/master/openpdf-html/src/main/java/org/openpdf/pdf/TrueTypeUtil.java#L71

https://github.com/LibrePDF/OpenPDF/blob/master/openpdf-core/src/main/java/org/openpdf/text/pdf/TrueTypeFont.java#L146

Initial report "TrueType fontloading broken due to reflection in openpdf lib":
quarkiverse/quarkus-itext#112

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Andreas Røsdal