[Predef-contribute] Some additions for the wiki

[Dallman, J. <joh...@si...>]

Microsoft Visual C++:

_MSC_FULL_VER exists in Visual C++ 8.0 onwards, not in VC7.1.

Clang:

__clang_version__ is a free-format string of version information,
apparently specified in the build of clang. Examples from Apple
released versions:

"2.1 (tags/Apple/clang-163.7.1)"
"4.0 ((tags/Apple/clang-421.0.60))"

lsbcc:

This is a front-end for GCC for the Linux Standard Base build tools.
It defines one numerical macro, __LSB_VERSION__, with the value Mm
for Major and minor version numbers of the LSB standards.

Thanks very much for this project: it's been very useful to me.


--
John Dallman

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