Shader fails to compile on Linux. It compiles fine on OSX (bot use OpenGL Core profile).

Steps to reproduce:
1) Open the latest attached project.
2) Try to recompile UnlitTextureColored.shader.

Error pops up in the console:
Shader error in 'NAKAI/Unlit/Texture Colored': 'constructor' : too many arguments at line 55 (on opengl)

Compiling Vertex program
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING SHADER_API_DESKTOP

Reproduced on:
5.5.0xb5, 5.4.1f1, 5.3.6f1
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FIXED ON 5.6.2f, but may fail due to Case 991968