cmd/snap-confine: set _FILE_OFFSET_BITS to 64

[zyga]

This fixes build issues on some 32bit systems which previously choked on
xfs header files and size of some structures.

Signed-off-by: Zygmunt Krynicki me@zygoon.pl

[Conan-Kudo]

This patch fixes the build for snapd 2.27~rc8 for Fedora.

[mvo5]

👍

[codecov-io]

Codecov Report

Merging #3699 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3699      +/-   ##
==========================================
+ Coverage   75.44%   75.48%   +0.03%     
==========================================
  Files         391      391              
  Lines       33745    33758      +13     
==========================================
+ Hits        25460    25481      +21     
+ Misses       6471     6464       -7     
+ Partials     1814     1813       -1

Impacted Files	Coverage Δ
cmd/snap-seccomp/main.go	49.79% <ø> (ø)	⬆️
cmd/snap/cmd_aliases.go	93.33% <0%> (-1.67%)	⬇️
overlord/ifacestate/helpers.go	63% <0%> (+0.66%)	⬆️
interfaces/sorting.go	100% <0%> (+1.28%)	⬆️
wrappers/binaries.go	79.31% <0%> (+10.34%)	⬆️
interfaces/builtin/joystick.go	60.71% <0%> (+15.71%)	⬆️
interfaces/builtin/framebuffer.go	44.73% <0%> (+17.46%)	⬆️

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