doc: remove passing --disable-external-signer
in OpenBSD build guide
#25178
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Since we have a Boost.Process usage check in the build system (#24254, commit abc057c), passing the option
--disable-external-signer
explicitly is not needed anymore on OpenBSD; the configure script will automatically detect that including<boost/process.hpp>
leads to a compile error and disable external signer support accordingly:The PR basically reverts #22335 but keeps the part mentioning that external signer support is not available on OpenBSD. Also bumps the guide to version 7.1 (released about a month ago), where I could verify that the instructions are still accurate.