Sync with upstream ggml-org/llama.cpp tag b7751

tools/perplexity/CMakeLists.txt

@@ -0,0 +1,8 @@
+set(TARGET llama-perplexity)
+add_executable(${TARGET} perplexity.cpp)
+target_link_libraries(${TARGET} PRIVATE common llama ${CMAKE_THREAD_LIBS_INIT})
+target_compile_features(${TARGET} PRIVATE cxx_std_17)
+
+if(LLAMA_TOOLS_INSTALL)
+    install(TARGETS ${TARGET} RUNTIME)
+endif()