Avoid error due to using GLSL 1.5 when unsupported #138
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Only use the "font_shader_vs_layout" shader program if OpenGL 3.2 is supported. According to https://en.wikipedia.org/wiki/OpenGL_Shading_Language#Versions this is required for GLSL 1.5. Fixes anura-engine#137
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Only use the "font_shader_vs_layout" shader program if OpenGL 3.2 is
supported. According to https://en.wikipedia.org/wiki/OpenGL_Shading_Language#Versions
this is required for GLSL 1.5.
Fixes #137