Fix FLAC library name on Mac.

external/CMakeLists.txt

@@ -875,7 +875,7 @@ if(ENABLE_CHANNELRX_REMOTETCPSINK)
     if (WIN32)
         install(FILES "${SDRANGEL_BINARY_BIN_DIR}/FLAC${CMAKE_SHARED_LIBRARY_SUFFIX}" DESTINATION "${INSTALL_LIB_DIR}")
     elseif (APPLE)
-        set(FLAC_LIBRARIES "${binary_dir}/flac/FLAC${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
+        set(FLAC_LIBRARIES "${binary_dir}/flac/libFLAC${CMAKE_SHARED_LIBRARY_SUFFIX}" CACHE INTERNAL "")
         install(DIRECTORY "${binary_dir}/libFLAC" DESTINATION "${INSTALL_LIB_DIR}"
                 FILES_MATCHING PATTERN "libFLAC*${CMAKE_SHARED_LIBRARY_SUFFIX}")
         set(MACOS_EXTERNAL_LIBS_FIXUP "${MACOS_EXTERNAL_LIBS_FIXUP};${binary_dir}/libFLAC")