On 64bit Windows, Cygwin installer sets the installation path as
"C:/tools/cygwin64", add this to the set of default locations when searching
for Cygwin.
Change-Id: I2d6ff0dfb18f24a595583c5a9c4b05d573e05e75
Reviewed-on: https://code.wireshark.org/review/25029
Reviewed-by: Graham Bloice <graham.bloice@trihedral.com>
"C:/Cygwin"
"C:/Cygwin64"
"C:/tools/cygwin"
+ "C:/tools/cygwin64"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Cygwin\\setup;rootdir]"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Cygnus Solutions\\Cygwin\\mounts v2\\/;native]"
)