In practice the changeset is 'inspired' by vosremoval-mutex.diff
but was essentially redone manually

3 helper class and a site were using OClearableGuard on the SolarMutex
None of these actually needed the Clearable feature, so
they were replaced by a simple SolarMutexGuard.

The class TBLSolarMutex is a wrapper guard arounf the SolarMutex.
the class SolarMutexGuard already provide this function.

ALBSolarGuard is awrapper guard around the SolarMutex
SolarMutexGuard provide this function now.

BBSloarGuard iw a simple guard wrapper around the SolarMutex.
the generic SolarMutexGuard provide this feature.

TCSolarGuard is a class that basically wrapped a Guard around Application::GetSolarMutex()
This function is now provided directly by the SolarMutexGuard class.

we removed the 3rd layer, so the extra package name does not longer makes sense;
it causes conflict with distro specific packages that are not versioned;
discussed on the mailing list

Additionally, fixes fdo#30667 with new about dialog text, and a
link to http://libreoffice.org/credits.html

These files don't seem to use LibreOffice coding style and types
anyway.

This source file does not seem to include any of the usual LibreOffice
headers, so we should not use SAL_N_ELEMENTS in it.