[CMake] CMake2.5 - wrong default install location for mingw

[Gonzalo Garramuño]

Compiling CMake HEAD with mingw.  After install, it defaulted to 
installing in $PROGRAMFILES/CMake, instead of /usr/local/ (ie. 
C:/msys/1.0/usr/local) incorrectly overwriting my MSVC version.



-- 
Gonzalo Garramuño
ggarra at advancedsl.com.ar

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