oatpp-openssl: add package_type, transitive_headers=True

[valgur]

Summary

Changes to recipe: oatpp-openssl/[*]

Motivation

One of the few remaining recipes that does not use import from conans ... but is still not Conan 2.x compatible.

Details

---

• Read the contributing guidelines
• Checked that this PR is not a duplicate: list of PRs by recipe
• Tested locally with at least one configuration using a recent version of Conan

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 2 (4af6a70eb97a0b9a060470e9cc8fdeb6f01eb489):

• oatpp-openssl/1.3.0:
  Built 20 packages out of 22 (All logs)

• oatpp-openssl/1.2.5:
  Built 20 packages out of 22 (All logs)

• oatpp-openssl/1.2.0:
  Built 20 packages out of 22 (All logs)

---

Conan v2 pipeline ✔️

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

All green in build 2 (4af6a70eb97a0b9a060470e9cc8fdeb6f01eb489):

• oatpp-openssl/1.3.0:
  Built 8 packages out of 10 (All logs)

• oatpp-openssl/1.2.5:
  Built 8 packages out of 10 (All logs)

• oatpp-openssl/1.2.0:
  Built 8 packages out of 10 (All logs)

[github-actions]

Hooks produced the following warnings for commit 4af6a70

oatpp-openssl/1.3.0@#3a121efd3741020f336c374be0012484

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/oatpp-1.3.0/liboatpp-openssl.so' links to system library 'm' but it is not in cpp_info.system_libs.

oatpp-openssl/1.2.5@#cbbd8504c372d39545a56e5d7f5f154b

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/oatpp-1.2.5/liboatpp-openssl.so' links to system library 'm' but it is not in cpp_info.system_libs.

oatpp-openssl/1.2.0@#a24168a1bd70b54379ca86eca63773f1

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/oatpp-1.2.0/liboatpp-openssl.so' links to system library 'm' but it is not in cpp_info.system_libs.