Taken from the Gentoo patch:
https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-devel/llvm-roc/files/llvm-roc-5.0.0-linkdl.patch

LLVMOffloadArch should link libdl to fix undefined symbol 'dlsym' when linking

--- a/llvm/lib/OffloadArch/offload-arch/CMakeLists.txt
+++ b/llvm/lib/OffloadArch/offload-arch/CMakeLists.txt
@@ -3,6 +3,7 @@ add_llvm_tool(offload-arch
   ${CMAKE_CURRENT_SOURCE_DIR}/offload-arch.cpp
   DEPENDS generated-table LLVMOffloadArch
 )
+target_link_libraries(LLVMOffloadArch PRIVATE ${CMAKE_DL_LIBS})
 target_link_libraries(offload-arch PRIVATE LLVMOffloadArch)
 
 if(CMAKE_HOST_UNIX)
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<tr><th>author</th><td>Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;</td><td class='right'>2023-04-11 08:44:57 -0400</td></tr>
<tr><th>committer</th><td>Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;</td><td class='right'>2023-04-14 15:12:06 -0400</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/guix/commit/gnu/services/virtualization.scm?id=9b2c1ff7f9be5db1cd8c99e60d99442a8586ad64'>9b2c1ff7f9be5db1cd8c99e60d99442a8586ad64</a> (<a href='/guix/patch/gnu/services/virtualization.scm?id=9b2c1ff7f9be5db1cd8c99e60d99442a8586ad64'>patch</a>)</td></tr>
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<div class='commit-subject'>gnu: python-pytest-subtests: Update to 0.10.0.</div><div class='commit-msg'>* gnu/packages/python-check.scm (python-pytest-subtests): Update to 0.10.0.
[native-inputs]: Replace python-pytest with python-pytest-7.1.
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