Configure fails when specifying -no-freetype

When specifying `-no-freetype` or `-freetype=no` with configure (or `-DINPUT_freetype=no` via cmake), Qt 6.3.0 fails to finish configuring, stating:

-- The following REQUIRED packages have not been found:

 * WrapFreetype

The configure help states that the valid options for `-freetype` are `[system/qt/no]`. This is also reflected in the Qt 6.3 docs for Freetype, and Qt 6.3.0's gui configure.cmake file. However, commit 5668522 made Freetype a required package for Qt 6.0, and none of the subsequent commits appears to have changed this requirement. This appears to be true for Qt 6.0-6.3 and dev.

If Freetype is actually required, then perhaps it makes more sense to remove the "no" option as a valid value. If the "no" option has some other meaning or purpose outside of disabling Freetype altogether, then that should be documented instead.