QT_RAW_INSTALL_FOO => QT_INSTALL_FOO/raw

QT_RAW_INSTALL_FOO => QT_INSTALL_FOO/raw

this makes the "sysrootable" properties more magic, with the raw
versions being omitted from the qmake -query output and automatically
falling back to the "cooked" variant if there is no sysroot set.

this makes the "normal" qmake -query less noisy. this will become even
more obvious when i add more "overloads" of the properties.

Change-Id: I08000986427264ec6238c8fe0a77f5cecdbf1201
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>