gdb: Add support for gdb 7.5.1 and make it the default

Signed-off-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
gdb: remove 6.8 / 7.0.1 / 7.1, deprecate 7.2 / 7.3

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
e2fsprogs: bump to version 1.42.7

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
ntfs-3g: bump to version 2013.1.13

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
flex: bump to version 2.5.37

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
sudo: bump to version 1.8.6p4

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>