fetch_tarballs is called by bootstrap when DO_FETCH_EXTERNAL is set to
true. So calling this here another time does not yield any benefit.

You could see this was happening, because it checked for wget and
mdsum twice at the beginning of each build.

All these did were outputting empty lines where already some were
being output leading to duplicate empty lines in the build log.

This silences the new "Unknown type!" error messages at the end of a
./configure run.

This should not make any functional difference, as the support for
those in ToFile was already missing.

grab the compiler version explicitly in unxlng.mk

Remove commented out code.
Remove $html_last_updated (unused).
Correct a few spelling mistakes.
Translate a few bits of German.

For every dev-install the install directory in rawbuild had to be removed. This
patch fixes that and consecutive dev-install works without manual intervention.

Replace system calls which performed single-file permission sets with calls to the built-in chmod.
Replace the implementation of create_directory with a call to create_directory_with_privileges.

Replace several system calls which performed single-file permission sets with the built-in chmod command.

Renamed all extensions to --enable-ext-* because
"we do want to present them together in ./configure --help"

See: b765a28ea9d63b60a14786b1a5484227175d413e

Deprecated old options not removed but commented instead.

¡There are still extensions which are only in build/configure.in!

Changed BUILD_TYPE from OOo to LibO

See: Elide all "SO:" and "OOo:" build.lst prefixes

Will be used by filter/source/config/fragments/makefile.mk.

Cwd::realpath does not work if the path does not exist

This fixes fdo#30568