net-mgmt/aircrack-ng: in sight of upcoming update, improve the port

• Uncomment INSTALL_TARGET and set it to `install-strip'; also, remove the bogus related comment, as setting WITH_DEBUG prevents stripping
• Allow to use Hardware Locality (devel/hwloc2) to improve performance
• Fix broken option disabling code: passing corresponding --disable-foo configure switch is sufficient except that for PCRE, small change to m4 code was required
• Fix `post-patch' target so it actually does what it supposed to and assume maintainership of the port