Other libraries that might be useful to allow multiple versions of in an env

[jhheider]

a continuation of the ideas in #61

• zlib (minor version locking/ubiquity)
• openssl (v1.1 vs v3)
• protobuf (v24, v25, etc.)
• fmt.dev (v9, v10, etc.)
• possibly llvm (for libunwind, libc++) or gcc (for libstdc++)
• python. so much that.
• cairographics. pango needs 1.16, rsvg needs pango and cairo >=1.17.

i'm sure there's others that prevent binaries from being used together, but those are the handful i can think of.