cmake: Remove unused CURL_CONFIG_HAS_BEEN_RUN_BEFORE variable

install(FILES "${CURL_BINARY_DIR}/libcurl.pc"

        DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)

# This needs to be run very last so other parts of the scripts can take advantage of this.

if(NOT CURL_CONFIG_HAS_BEEN_RUN_BEFORE)

  set(CURL_CONFIG_HAS_BEEN_RUN_BEFORE 1 CACHE INTERNAL "Flag to track whether this is the first time running CMake or if CMake has been configured before")

endif()

# install headers

install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/include/curl"

    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}