xbps-src: Don't unset IFS

[heindsight]

If IFS is unset, the shell behaves as if it has the default value of <space><tab><newline>. However, after unsetting IFS, constructs like

OFS="$IFS"; IFS=','
...
IFS="$OIFS"

(for example in common/xbps-src/shutils/common.sh lines 246-253) have the effect of setting IFS with an empty value, which breaks word-splitting. This results in an error like

./common/xbps-src/shutils/bulk.sh: line 125: sudo /bin/sh -c: No such file or directory

when running ./xbps-src update-sys with XBPS_SUCMD set to the default value (sudo /bin/sh -c).

Testing the changes

• I tested the changes in this PR: yes

[github-actions[bot]]

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