vtk: Depends on linuxbrew/xorg/mesa for Linuxbrew
vtk: Depends on linuxbrew/xorg/mesa for Linuxbrew

Fix the error:
Could NOT find OpenGL (missing: OPENGL_gl_LIBRARY OPENGL_INCLUDE_DIR)

Closes #5257.

Signed-off-by: Shaun Jackman <b580dab3251a9622aba3803114310c23fdb42900@gmail.com>

philippbayer/homebrew-science,heuermh/homebrew-science,andrewjpage/homebrew-science,pditommaso/homebrew-science,dpo/homebrew-science,quantumsteve/homebrew-science