formula: stevengj/nlopt

[MeteorsLiu]

Summary

• Adds the idiomatic LLAR Formula for stevengj/nlopt from Conan Center snapshot d034b32b3106d282c32f0a23314b5c6ba1b0fa69.
• Preserves the verified shared, fPIC, and enable_cxx_routines options, disables unused upstream bindings/tests, and carries the recipe licenses.
• Publishes relocatable nlopt.pc metadata and verifies the optimization consumer through the complete pkg-config lookup.

Evidence

• Exact Conan source pin 2.9.1 resolves to upstream tag v2.9.1 and peeled revision 11cff2c773b4b98821915a72179f4667c307ce6d; the recorded archive SHA256 matches.
• fromVer is the earliest compatible recipe tag v2.6.1; all seven Conan-served tags through v2.9.1 and the current default v2.11.0 passed on native darwin/arm64.
• Fresh and cache-hit tests passed, including shared=ON, fPIC=OFF, and enable_cxx_routines=OFF; v2.6.0 is rejected below the floor.

Closes #247

[fennoai]

Reviewed the NLopt formula and module metadata across the complete fixed diff. The package build, generated pkg-config metadata, license installation, consumer test, and registry shape are consistent; the inline finding below concerns the exposed fPIC option for newer upstream versions.

Verification included LLAR builds/tests for v2.8.0 on linux/amd64 with default options and with --option fPIC=OFF, plus direct upstream CMake checks across v2.6.1 and v2.8.0.

[fennoai]

[P1] Do not expose ineffective fPIC=OFF for v2.8+

Because this formula serves every version from v2.6.1 onward, it also handles v2.8.0+, whose upstream CMakeLists.txt unconditionally sets the nlopt target's POSITION_INDEPENDENT_CODE to ON. Consequently, CMAKE_POSITION_INDEPENDENT_CODE=OFF here is ignored for those releases: an explicit --option fPIC=OFF still compiles the static archive with -fPIC. That makes the retained option produce a result different from what callers requested. Please split the formula at v2.8.0 (or otherwise remove/reject this option for that range) so fPIC=OFF is not advertised where upstream cannot honor it.