MFC r291145:
Fix scancodes for Kana and Eisu keys.

PR: 204709

MFC r275709

handle "Kana" and "Eisu" keys on Apple Wireless Keyboard (JIS)

PR: 187470
Submitted by: naito.yuichiro

MFC r258779,r258780,r258787,r258822:

Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this
shifts into the sign bit. Instead use (1U << 31) which gets the
expected result.

Similar to the (1 << 31) case it is not defined to do (2 << 30).

This fix is not ideal as it assumes a 32 bit int, but does fix the issue
for most cases.

A similar change was made in OpenBSD.

MFC r275709

handle "Kana" and "Eisu" keys on Apple Wireless Keyboard (JIS)

PR: 187470
Submitted by: naito.yuichiro

MFC r258779,r258780,r258787,r258822:

Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this
shifts into the sign bit. Instead use (1U << 31) which gets the
expected result.

Similar to the (1 << 31) case it is not defined to do (2 << 30).

This fix is not ideal as it assumes a 32 bit int, but does fix the issue
for most cases.

A similar change was made in OpenBSD.