[SYCL][NFC] SYCL RT CMakeLists cleanup [5/N]

[AlexeySachkov]

Consolidated all common (i.e. non-conditional) linked libraries settings for SYCL RT build in a single place.

[uditagarwal97]

Do we don't want to link UnifiedRuntime-Headers, UnifiedRuntimeCommon libraries? I don't see linking these in the code above:

target_link_libraries(${LIB_NAME}
    PRIVATE
      ${CMAKE_DL_LIBS}
      ${CMAKE_THREAD_LIBS_INIT}
      $<$<NOT:$<BOOL:${WIN32}>>:UnifiedRuntimeLoader>
      $<$<BOOL:${WIN32}>:shlwapi>
  )

[AlexeySachkov]

UR headers is an INTERFACE library - it only provides include directories and since LIB_NAME is a link-only target, we do not care about include directories there. Note that we still "link" that interface library to LIB_OBJ_NAME target, see #17413 and review comments there (similar question).

UR common seems to be an internal library which shouldn't be used by anyone outside of the UR. Once again, see the aforementioned #17413 and #17388 for confirmations from UR folks that we shouldn't use their common library