Currently in the documentation which comment is attached to which member
in the pspUtilityDialogCommon struct is wrong. Size does not have a
description and all others mismatch. This commit fixes that. See the
current state here: http://pspdev.github.io/pspsdk/structpspUtilityDialogCommon.html
Fixes#123. Guards `_PSP_FW_VERSION` references with `#if defined()` to avoid the SDK headers returning warnings when compiling modules with the `-Wundef` cflag.
