[ORC] Fix the prototype of a C API function. (#139259)
In 38d16f509a3faff3c545da5bfd5a8bcbd234ff24, the `TargetTriple` argument
was removed from the `LLVMOrcCreateStaticLibrarySearchGeneratorForPath`
without updating the C API headers. This resulted in the function being
exported without C linkage, making it impossible to use from C.
Co-authored-by: Lang Hames <lhames@gmail.com>
