meshoptimizer: add version 0.20

[RazielXYZ]

Specify library name and version: meshoptimizer/0.20

Version bump; only change to conanfile is that CMakeLists no longer needs to be modified.

---

• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 2 (c7ad33755bbb8d4d2c46f42ea5802960ca9edb98):

• meshoptimizer/0.16:
  All packages built successfully! (All logs)

• meshoptimizer/0.15:
  All packages built successfully! (All logs)

• meshoptimizer/0.20:
  All packages built successfully! (All logs)

• meshoptimizer/0.17:
  All packages built successfully! (All logs)

• meshoptimizer/0.14:
  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 2 (c7ad33755bbb8d4d2c46f42ea5802960ca9edb98):

• meshoptimizer/0.20:
  All packages built successfully! (All logs)

• meshoptimizer/0.14:
  All packages built successfully! (All logs)

• meshoptimizer/0.16:
  All packages built successfully! (All logs)

• meshoptimizer/0.15:
  All packages built successfully! (All logs)

• meshoptimizer/0.17:
  All packages built successfully! (All logs)

[github-actions]

Hooks produced the following warnings for commit c7ad337

meshoptimizer/0.16@#9483f82d4ea1cb1c8374bcf3386cdcb3

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

meshoptimizer/0.15@#0399871026b80b9d25379397ada87d70

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

meshoptimizer/0.20@#0c347dc70c504dc5be5c89e12e3df3e9

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

meshoptimizer/0.17@#3bcd5c5c664de96c31077ad36113f1da

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

meshoptimizer/0.14@#1883018ccc064401851cc96ba6a71d49

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