pscx2: s/wxTrap/pxTrap/

wxTrap is only enabled on wxDebug build. pxTrap is always available. It is much nicer for debug on linux
clang: no support of f-abi-version=6 option
build.sh: wx30 is the default, the option is useless
pcsx2: fix a gcc warning
remove zzogl-pg-cg

superseeded by zzogl-pg