[lit][REQUIRES] Fix llvm-debuginfod.test so it will run

[probinson]

Summary

The test was added in D114846 but missed one place to introduce the
'httplib' feature keyword, so it has been UNSUPPORTED everywhere.

I don't have curl or httplib locally; I can hack my lit config to
verify this keeps the test from being UNSUPPORTED everywhere, but
someone else will need to verify that it actually works.

[mysterymath]

Ah, thanks for finding this. I've been able to verify that this allows the llvm-debuginfod.test test to run and pass when the build is configured with curl and httplib.

llvm/test/lit.cfg.py

if config.enable_threads:
     config.available_features.add('thread_support')
 
 if config.have_libxml2:
     config.available_features.add('libxml2')
 
 if config.have_curl:
     config.available_features.add('curl')
 
+if config.have_httplib:
+    config.available_features.add('httplib')
+
 if config.have_opt_viewer_modules:
     config.available_features.add('have_opt_viewer_modules')
 
 if config.expensive_checks:
     config.available_features.add('expensive_checks')
 
 if "MemoryWithOrigins" in config.llvm_use_sanitizer:
     config.available_features.add('use_msan_with_origins')