Build warnings with pedantic flags

[tore-espressif]

Pedantic build with following compile options fails

export PEDANTIC_FLAGS="-DIDF_CI_BUILD -Werror -Werror=deprecated-declarations -Werror=unused-variable -Werror=unused-but-set-variable -Werror=unused-function"
export PEDANTIC_CFLAGS="${PEDANTIC_FLAGS} -Wstrict-prototypes"
export PEDANTIC_CXXFLAGS="${PEDANTIC_FLAGS}"
export EXTRA_CFLAGS=${PEDANTIC_CFLAGS}
export EXTRA_CXXFLAGS=${PEDANTIC_CXXFLAGS}

Could you please fix the build warnings or disable the warnings (-Wno-strict-prototypes should help)

Related espressif/esp-bsp#51

[me-no-dev]

@tore-espressif can I add this somehow to our CI?Manually building it does not seem like ling term solution.

[tore-espressif]

I prepared a PR here #529

[github-actions]

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