Fix missing extern declaration Variable declarations in headers need to be "extern". Fix missing "extern" in input.h. (Turns it it was there previously and was erroneously removed in a previous clean up patch.) Thank you to John W. Linville <linville@redhat.com> for reporting the problem.

\.exe$
\.o$
\.d$
\.a$
~$
\.orig$
/lwbasic$
/lwlink$
/lwobjdump$
/lwar$
/lwasm$
/lwcc/lwcc$
/lwcc/lwcc-cpp$
/lwcc/lwcc-cc

# for windows
\.suo$
\.sdf$
\.opensdf$
\Debug$
\Release$