Fix building of GLSL demos which use M_PI when M_PI is not defined by math.h

Submitted by Jon Turney `@jturney`

Assigned to mes..@..op.org

Created attachment 30074 Patch to fix building of GLSL demos which use M_PI when M_PI is not defined by math.h

Some <math.h> files do not define M_PI, in which case, we must provide our own definition. This is done for most demos, but not for the GLSL demos.

~~Patch 30074~~, "Patch to fix building of GLSL demos which use M_PI when M_PI is not defined by math.h":
0002-Fix-building-of-GLSL-demos-which-use-M_PI.patch

Version: git

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