gl2ps: prevent linking against X11's libglut.dylib
gl2ps: prevent linking against X11's libglut.dylib

To avoid "accidentally" linking against X11's libglut.dylib when X11
happens to be installed, manually set

  GLUT_glut_LIBRARY=/System/Library/Frameworks/GLUT.framework

This allows the bottle build server to have X11 installed, but not end
up forcing us to add an X11 requirement to the formula.

Closes #50601.

Signed-off-by: ilovezfs <fbd54dbbcf9e596abad4ccdc4dfc17f80ebeaee2@icloud.com>

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