Review Request: Look for ext/hash_map and unordered_map instead of checking gcc's version.

[György Andrasek]

Breaks the build on GCC:

> Building CXX object
language/CMakeFiles/kdevplatformlanguage.dir/backgroundparser/backgroundparser.o


> In file included from
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/../../../../include/c++/4.6.3/unordered_map:35:0,


>                  from
/home/jurily/projects/extern/kdevplatform/language/editor/modificationrevision.cpp:31:
>
/usr/lib64/gcc/x86_64-pc-linux-gnu/4.6.3/../../../../include/c++/4.6.3/bits/c++0x_warning.h:32:2:
error: #error This file requires compiler and library support for the
upcoming ISO C++ standard, C++0x. This support is currently experimental,
and must be enabled with the -std=c++0x or -std=gnu++0x compiler options.
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