[PATCH] C++ preprocessor fixes

[Dmitry Risenberg]

Hi all!

Attached is a patch that fixes C++ preprocessor implementation to work
according to the standard. This fixes
https://bugs.kde.org/show_bug.cgi?id=256433. Also some other macros
from Boost library are now expanded correctly.
An incorrect position in source is reported for a declaration in a
corner-case when the identifier is a result of concatenation by "##"
token - see lines 1782-1791 in test_cppcodecompletion.cpp. Fixing this
case doesn't look possible with current implementation, because the
concatenated string is treated as a whole after all '##" are applied.

-- 
Dmitry Risenberg
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