[MacPorts] #56959: librsvg: building requires rust compiler

[MacPorts]

#56959: librsvg: building requires rust compiler
----------------------+----------------------
 Reporter:  07151129  |      Owner:  devans@…
     Type:  defect    |     Status:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  librsvg
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 Newer versions of librsvg (≥ 2.40.0) require rust compiler and cargo for
 building. This is a rather large dependency including llvm which is not
 always desirable to have installed, especially if it is not needed
 otherwise. Many ports depend on librsvg and thus suddenly depend on
 rust/cargo/llvm for building, even if there is no rust code in their
 codebase.

 Because the newer versions of librsvg are ABI-compatible with the old
 version that only required a working C compiler, it would be nice if the
 old version was provided as a variant.

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Ticket URL: <https://trac.macports.org/ticket/56959>
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