revert +frame-pointer exceptions for gc,callcc

testing showed that forcing %ebp does not help, -O0 for callcc
  and -fno-stack-protector does help, use -O3 fine on gc and internal.
force icc to use stackdir -1, do not test on intel hw.
remove POTION_ARGS_DIR test, not yet needed.
change preferred cc on linux from clang-3.3 to gcc-4.8 (surprise)
add examples target.
pass CC to libuv configure.
do not build extlibs and dynlibs on target pn.