in a slightly better way for more platforms. The $HOME is only used for
.curlrc atm, but the possible upcoming change of .netrc treatment may also
need the home dir.

#include "../lib/memdebug.h" for memory debug builds.

command line.

we attempt to hide some of the more sensitive command line arguments

so we need to hack around it when not there

it is a bit ugly work-around to add this here, it is still a working work-
around! ;-)