UnitOpenGLImagePNG + UnitOpenGLImageJPEG issues with freepascal

[JernejL]

This unit does not compile under freepascal 3.0.4:
UnitOpenGLImagePNG.pas(259,9) Error: ENDIF without IF(N)DEF

Working around that, compilation later fails at UnitOpenGLImageJPEG:
UnitOpenGLImageJPEG.pas(237,16) Error: Identifier not found "TFPReaderJPEG"

[JernejL]

I got it to compile in freepascal by working around the 2 problems (commented out openglimagejpeg) and it runs, but it's unable to load any gltf files, it always raises EPasGLTFInvalidDocument exception and then dies in main loop here:

EAccessViolation: Access violation
$004045B5 MAINLOOP, line 1014 of PasGLTFViewer.dpr
$004058DE main, line 1440 of PasGLTFViewer.dpr

[BeRo1985]

fixed