[compiler-rt] [compiler-rt][memprof] Do not add libdl to MEMPROF_UNITTEST_LINK_LIBRARIES (PR #98221)

[NAKAMURA Takumi via llvm-commits]

chapuni wrote:

This fails linking MemProfTests on Linux.

sanitizer_linux_libcdep.cpp uses `dlsym` but sanitizer_common doesn't provide deps on `-ldl`.

https://github.com/llvm/llvm-project/pull/98221