[examples] Fix PBR and Shadowmap example shaders for GLSL 1.20 #4167
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Removed presicion mediump float because it is for GLES, and not desktop GL.
also removed 'in' that are in a multitude of lines, because someone when porting it didn't remove it and didn't test it.
Tested on
Mesa Mobile Intel® GM45 Express Chipset (CTG) (0x2a42)
it works.