Change header search path to private

Author: EAddario

tools/imatrix/CMakeLists.txt

@@ -2,5 +2,5 @@ set(TARGET llama-imatrix)
 add_executable(${TARGET} imatrix.cpp)
 install(TARGETS ${TARGET} RUNTIME)
 target_link_libraries(${TARGET} PRIVATE common llama ${CMAKE_THREAD_LIBS_INIT})
-target_include_directories(${TARGET} PUBLIC ../../src)
+target_include_directories(${TARGET} PRIVATE ../../src)
 target_compile_features(${TARGET} PRIVATE cxx_std_17)