[CMake] CMAKE_TOOLCHAIN_FILE support, empty CMAKE_AR && CMAKE_RANLIB

[Oleg Kravchenko]

Hello i am try build tinyxml library by mingw32 on gentoo linux with cmake:
=dev-util/cmake-2.6.4-r3
=dev-util/cmake-2.8.0-r2

But have this errors:
$ cmake -DCMAKE_TOOLCHAIN_FILE=~/i686-pc-mingw32.cmake -
DDOKAN_INCLUDE_DIR=~/projects/dokan/ -DCMAKE_BUILD_TYPE=Debug .
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/i686-pc-mingw32-gcc
-- Check for working C compiler: /usr/bin/i686-pc-mingw32-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/i686-pc-mingw32-g++
-- Check for working CXX compiler: /usr/bin/i686-pc-mingw32-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/kaa/projects/tinyxml
$ make
[ 12%] Building CXX object 
tinyxml_build/CMakeFiles/tinyxml.dir/tinystr.cpp.obj
[ 25%] Building CXX object 
tinyxml_build/CMakeFiles/tinyxml.dir/tinyxml.cpp.obj
[ 37%] Building CXX object 
tinyxml_build/CMakeFiles/tinyxml.dir/tinyxmlerror.cpp.obj
[ 50%] Building CXX object 
tinyxml_build/CMakeFiles/tinyxml.dir/tinyxmlparser.cpp.obj
Linking CXX static library /home/kaa/projects/sqlfs/target/Debug/libtinyxml.a
Error running link command: No such file or directory
make[2]: *** [/home/kaa/projects/win32/target/Debug/libtinyxml.a] Error 2
make[1]: *** [tinyxml_build/CMakeFiles/tinyxml.dir/all] Error 2
make: *** [all] Error 2

I "fix" problem by patching CMakeFindBinUtils.cmake

Please fix and release 2.6.x and 2.8.x version
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