bug#27429: Stack clash (CVE-2017-1000366 etc)

[Leo Famulari]

On the glibc bugs (CVE-2016-1000366), civodul said:

[21:02:26]      <civodul>       lfam: i *think* GuixSD is immune to the 
LD_LIBRARY_PATH one, FWIW
[...]
[21:02:43]      <civodul>       lfam: because of the way is_trusted_path works 
in glibc

https://gnunet.org/bot/log/guix/2017-06-19#T1422600

Relevant upstream commits:

CVE-2017-1000366: Ignore LD_LIBRARY_PATH for AT_SECURE=1 programs [BZ #21624]
https://sourceware.org/git/?p=glibc.git;a=commit;h=f6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d

ld.so: Reject overly long LD_PRELOAD path elements
https://sourceware.org/git/?p=glibc.git;a=commit;h=6d0ba622891bed9d8394eef1935add53003b12e8

ld.so: Reject overly long LD_AUDIT path elements:
https://sourceware.org/git/?p=glibc.git;a=commit;h=81b82fb966ffbd94353f793ad17116c6088dedd9

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