Bazel+LWIP+FreeRTOS fails due to incorrect reference to bazel/config

[jaguilar]

cc_library(
    name = "pico_lwip_contrib_freertos",
    srcs = ["ports/freertos/sys_arch.c"],
    includes = ["ports/freertos/include"],
    target_compatible_with = incompatible_with_config(
        "@pico-sdk//bazel/constraint:pico_freertos_unset",
    ),
    deps = [
        ":pico_lwip_core",
        "//bazel/config:PICO_FREERTOS_LIB",
    ],
)

This is the current state of the code in lwip.BUILD. The //bazel/config directory doesn't exist in the lwip project. We mean to refer to the one in the pico-sdk, like elswehwere in the file, including immediately above. Will send a pull request momentarily.