The binaries are built and installed if HAVE_TPM2 is set, and ignore ENABLE_BOOTLOADER, so do the same for the manpages. For the sd-pcrlock case this also installs the manpage aliases for the units, which are not installed with -Dbootloader=disabled, but there's no way to conditionalize the aliases, so on balance it's better to have too much documentation rather than too little. Fixes https://github.com/systemd/systemd/issues/30588
System and Service Manager
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