that'd require CLUCENE_CFLAGS everywhere where it's used, and it's not necessary

changed the text to really only paste text, also added pasteonly | number

This somehow fell through the cracks of gbuildification -
make timelog=t now again enables those RTL_LOGFILE_ macros.

CLucene apparently does not bother with self-contained headers

Maybe they'll be supported somewhen in the future, so do not hardcode
them out. Also, gb_DEBUG_C(XX)FLAGS are apparently common GCC options,
not platform-specific.

the argument given now can
- be 'all', meaning everything
- start with -, meaning not to enable symbols for that item
- end with /, meaning everything in that toplevel directory
- be a target of the form targettype_name, e.g. Library_swui

Note that there is no ordering and removal takes precedence.

- move using optimization, symbols (i.e. debug) and environment
    cflags/cxxflags into one place
- --enable-dbgutils is independent from --enable-debug, and thus
    also --enable-symbols, so it should not set debuglevel
- setting -g flag is controlled by --enable-symbols, not --enable-debug,
    so it should be used also for selective -g enabling
- setting debug flags depending on debuglevel being 2 is certainly wrong
- do not let environment cflags/cxxflags disable optimization/symbols flags
  completely, if one wants, it's possible to explicitly specify e.g. -g0,
  but the current way does not make it easily possible to specify e.g.
  -fcolor-diagnostics
- do not set debug flag globally now that it can be done selectively

This is to avoid unintended regressions based on configure options.

It did not help with the race condition at all.
This reverts commit 1b62ccdc.

including important bug fixes