Fix ecvt_r, fcvt_r namespace (bug 18522)

[Carlos O'Donell]

On 06/11/2015 06:28 PM, Joseph Myers wrote:
> The functions ecvt, fcvt and gcvt, in some standards, bring in
> references to ecvt_r and fcvt_r, which aren't in any of those
> standards.  The calls are correctly to __ecvt_r and __fcvt_r, but then
> the names ecvt_r and fcvt_r are defined as strong aliases; this patch
> changes them to weak aliases.
> 
> Tested for x86_64 and x86 (testsuite, and that disassembly of
> installed stripped shared libraries is unchanged by the patch).
> 
> 2015-06-11  Joseph Myers  <joseph@codesourcery.com>
> 
> 	[BZ #18522]
> 	* misc/efgcvt_r.c
> 	[LONG_DOUBLE_COMPAT (libc, GLIBC_2_0) && !LONG_DOUBLE_CVT]
> 	(cvt_symbol): Use weak_alias instead of strong_alias.
> 	[LONG_DOUBLE_COMPAT (libc, GLIBC_2_0)] (cvt_symbol): Likewise.
> 	* conform/Makefile (test-xfail-XPG4/stdlib.h/linknamespace):
> 	Remove variable.
> 	(test-xfail-UNIX98/stdlib.h/linknamespace): Likewise.
> 	(test-xfail-XOPEN2K/stdlib.h/linknamespace): Likewise.

Looks good to me.

c.