[llvm] [llvm] Fix SupportHTTP linkage with libLLVM in unit-tests (PR #190097)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 99887 tests passed
* 2039 tests skipped

All executed tests passed, but another part of the build **failed**. Click on a failure below to see the details.

<details>
<summary>unittests/Debuginfod/DebuginfodTests</summary>

```
FAILED: unittests/Debuginfod/DebuginfodTests
: && /opt/llvm/bin/clang++ -gmlt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -no-pie -fuse-ld=lld -Wl,--color-diagnostics    -Wl,--gc-sections unittests/Debuginfod/CMakeFiles/DebuginfodTests.dir/DebuginfodTests.cpp.o -o unittests/Debuginfod/DebuginfodTests  -lLLVMLLVMSupportHTTP  lib/libLLVMSupport.a  lib/libllvm_gtest_main.a  lib/libllvm_gtest.a  lib/libLLVMDebuginfod.a  lib/libLLVMTestingSupport.a  lib/libLLVMSupportHTTP.a  lib/libLLVMSymbolize.a  lib/libLLVMDebugInfoGSYM.a  lib/libLLVMDebugInfoPDB.a  lib/libLLVMDebugInfoCodeView.a  lib/libLLVMDebugInfoMSF.a  lib/libLLVMDebugInfoBTF.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMObject.a  lib/libLLVMIRReader.a  lib/libLLVMBitReader.a  lib/libLLVMAsmParser.a  lib/libLLVMCore.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a  lib/libLLVMMCParser.a  lib/libLLVMMC.a  lib/libLLVMDebugInfoDWARFLowLevel.a  lib/libLLVMTextAPI.a  lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a  lib/libllvm_gtest.a  lib/libLLVMSupport.a  -lrt  -ldl  -lm  /usr/lib/x86_64-linux-gnu/libz.so  lib/libLLVMDemangle.a  -lpthread && :
ld.lld: error: unable to find library -lLLVMLLVMSupportHTTP
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
```
</details>
<details>
<summary>unittests/Support/HTTP/SupportHTTPTests</summary>

```
FAILED: unittests/Support/HTTP/SupportHTTPTests
: && /opt/llvm/bin/clang++ -gmlt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -no-pie -fuse-ld=lld -Wl,--color-diagnostics    -Wl,--gc-sections unittests/Support/HTTP/CMakeFiles/SupportHTTPTests.dir/HTTPServerTests.cpp.o -o unittests/Support/HTTP/SupportHTTPTests  -lLLVMLLVMSupportHTTP  lib/libLLVMSupport.a  lib/libllvm_gtest_main.a  lib/libllvm_gtest.a  lib/libLLVMTestingSupport.a  lib/libllvm_gtest.a  lib/libLLVMSupport.a  -lrt  -ldl  -lm  /usr/lib/x86_64-linux-gnu/libz.so  lib/libLLVMDemangle.a  -lpthread && :
ld.lld: error: unable to find library -lLLVMLLVMSupportHTTP
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/190097