Using config_xxx.h instead of -DHAVE_XXX

[Lubos Lunak]

 Hello,

 currently our build system adds -DHAVE_XXX options to the compile command 
line for various settings, which does not quite scale, and does not cause 
relevant files to rebuild, so the common practice nowadays is to use config.h 
file(s).

 The attached patches implement this change and add one new test (together 
with bringing OUStringBuffer::append(bool) in again). Unless somebody sees a 
problem with this, I'll push them soon.

 There are more such -D options that could be changed, although with some it'd 
be better be careful, e.g. OSL_DEBUG can't go there, because it can be 
overriden by command-line, and I'm not sure if adding #include 
<config_global.h> to sal/config.h would be really included everywhere where 
needed.

-- 
 Lubos Lunak
 l.lunak at suse.cz
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