Closes #4369

Default tar permissiong make it impossible to apply patches to some of
the files.

Change extraction command to skip permissions by using "-O" tar option
and a pipe tar chain.

Solution suggested by: Arnout Vandecappelle <arnout@mind.be>

[Peter: rework to use define as suggested by Thomas]
Signed-off-by: Damian Kaczmarek <damian@veritymedical.co.uk>
Tested-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>