wlanhcx2psk: Add static + other fixes for smaller size.
wlanhcx2psk: Add static + other fixes for smaller size.

From 36200 to 31128 bytes with clang. Not bad.

ZerBea/hcxtools,ZerBea/hcxtools,RealEnder/hcxtools,ZerBea/hcxtools,RealEnder/hcxtools,RealEnder/hcxtools