refactor: test_package for libjpeg

[ErniGH]

Simplify the test_package in according to our policies:

• write the minimal test that tests the package (the compiler can find the correct includes, the static linker can resolve symbols, the runtime linker can resolve symbols)
• do not perform heavy logic in CI
• remove binary blob - these will no longer be allowed anywhere in the repository
• Remove the test_v1_package and the image - it is not worth backporting the refactor to the legacy test

[CLAassistant]

All committers have signed the CLA.

[ghost]

I detected other pull requests that are modifying libjpeg/all recipe:

• libjpeg - Use MSBuild for windows platforms #21628 #23494
• libjpeg: add v9f, drop vulnerable version 9c #23258

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[valgur]

I'm not sure if it's ok to remove test_v1_packages already, but otherwise looks good. Thanks! The test executable was doing way too much, indeed.

[jcar87]

we can probably still test this minimally - this appears to be unconditionally included in the recipe.
perhaps just add an #include "transupp.h" in test_package.c and that's it.

[jcar87]

Just one small comment, but rest is great :D

[jcar87]

I'm not sure if it's ok to remove test_v1_packages already, but otherwise looks good. Thanks! The test executable was doing way too much, indeed.

Thanks @valgur!

One of the goals of this PR is not only to simplify the test package, but to also remove any test that make use of binary files - these will no longer be accepted in any test package or in any PR. test_v1_package are no longer required for newly added recipes (as per announcement) - but they can be removed if they get in the way of maintenance - in this case I see no point in backporting the simplification to the old test package. Perhaps we can word this better in the announcement. What we won't accept and is only reserved to Conan team maintainers, is removal of test_v1_package without any reason - the team will deal with the removal at a later date (@ErniGH is a member of the team).

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 5 (080e2671a8590a4a17a8c87256c20ec6d97f246f):

• libjpeg/9e:
  All packages built successfully! (All logs)

• libjpeg/9c:
  All packages built successfully! (All logs)

• libjpeg/9d:
  All packages built successfully! (All logs)

---

Conan v2 pipeline ✔️

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

All green in build 5 (080e2671a8590a4a17a8c87256c20ec6d97f246f):

• libjpeg/9e:
  All packages built successfully! (All logs)

• libjpeg/9d:
  All packages built successfully! (All logs)

• libjpeg/9c:
  All packages built successfully! (All logs)