Cygwin: Use gcc for 64 bit.

git-svn-id: http://svn.aircrack-ng.org/trunk@2298 28c6078b-6c39-48e3-add9-af49d547ecab
Makefile: Trying to fix gcc 4.5+ detection.

git-svn-id: http://svn.aircrack-ng.org/trunk@2299 28c6078b-6c39-48e3-add9-af49d547ecab
Airodump-ng: Fixed untriggerable (since function is not called) memory leak (and disable compilation of that function).

git-svn-id: http://svn.aircrack-ng.org/trunk@2300 28c6078b-6c39-48e3-add9-af49d547ecab
Removed dead assignment.

git-svn-id: http://svn.aircrack-ng.org/trunk@2301 28c6078b-6c39-48e3-add9-af49d547ecab