LD_PRELOAD causes stack smashing error in gpg

[NIIBE Yutaka]

Hello,

devnoname120 wrote:
> For some reason gpg doesn’t seem to like when a RegEx is compiled in
> the constructor of a preloaded library.

Please see:

	https://dev/gnupg.org/T7668

We use the internal replacement of regex_* routines for GnuPG, so that
we can support OS without regexp, and we can avoid interoperability
problem among different implementations.

The bug you encountered is a problem of using ABI difference of regex_*.
The ones in system libc and the ones in the internal replacement are not
ABI same, but use different regexp_t.

GnuPG 2.6 has a fix (replacing the symbols with a prefix) for no conflict.

BTW, today, I modified the wrong prefix in master.
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