Skip lightmap + deluxegrid shader permutations compilation and skip “proxy” shader compilation

[illwieckz]

Fix #1863 and #1925:

• Shader build error does not give a clue which shader it was #1863
• Some GLSL shader doesn't link with r_lazyShaders 0 #1925

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Not anymore:

Includes #1922:

• gl_shader: fix shader dump line numbering #1922

[slipher]

For skipping lightmap + grid deluxe I believe I have a simpler implementation in the first two commits of #1920.

[illwieckz]

For skipping lightmap + grid deluxe I believe I have a simpler implementation in the first two commits of #1920.

If that PR has generic fixes that can be merged without the rest of the draft, please submit them separately. =)

[slipher]

For skipping lightmap + grid deluxe I believe I have a simpler implementation in the first two commits of #1920.

Can now be found in #1928

[illwieckz]

Commit for “lightmap + grid deluxe skip” removed in favor of (now merged):

• Disable building of some impossible GLSL permutations #1928

Removed commit from:

• gl_shader: fix shader dump line numbering #1922

It was initially included in that branch because it helped me to debug.
I still want to merge it, but it already has a dedicated PR.

[slipher]

LGTM