Replace FXFONT_USEEXTERNATTR define with kFontUseExternAttr constexprNit:
```suggestion
Replace FXFONT_USEEXTERNATTR define with constexpr kFontUseExternAttr
```
Move the "use external attributes" font flag from a preprocessor define into namespace pdfium as an inline constexpr uint32_t, alongside the existing FontStyle/FontWeight/FontPitchFamily enums.Wrap Line 9
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