[CMake] namespace support

[Peter Kümmel]

Because good solution is not available
I've added the mentioned namespace support
to CMake:

   namespace(<string>)
   endnamespace()

With attached patch it is possible to write
code like this (imagine antiX.cpp does not
compile when the macro X is set):

namespace(x)
   add_definitions(-DX)
   add_library(X x.cpp)
endnamespace()
add_library(antiX antiX.cpp)


The ticket is here
http://www.cmake.org/Bug/view.php?id=11793


I hope it could be added in this or an
similar form to CMake.

Peter

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