hw: Rename boolean config value field from bool to _bool

Merged Adam Jackson requested to merge ajax/xserver:_bool into master

"bool" conflicts with C++ (meh) and stdbool.h (ngh alright fine). This is a driver-visible change and will likely break the build for mach64, but it can be fixed by simply using xf86ReturnOptValBool like every other driver.

Signed-off-by: Adam Jackson ajax@redhat.com

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