[PATCH] regex: simplify Gnulib port

[Siddhesh Poyarekar]

On 27/12/18 3:53 AM, Paul Eggert wrote:
> This simplifies the code, by removing stuff intended for porting
> to Gnulib but no longer needed there.
> * posix/regcomp.c [!_LIBC]: No need to put #ifdef _LIBC around
> uses of libc_hidden_def, weak_alias.
> * posix/regcomp.c, posix/regexec.c: Use __restrict rather than
> _Restrict_ except for public-facing headers.
> * posix/regex_internal.h (attribute_hidden) [!_LIBC]:
> Remove; already defined elsewhere.
> * posix/regex.c, posix/regex_internal.h:
> Use __GNUC_PREREQ instead of rolling our own.
> * posix/regex_internal.h (__GNUC_PREREQ): Remove duplicate defn.

Looks good to me.

Thanks,
Siddhesh