[Patch, libfortran] Fix usage of secure_getenv with glibc 2.17

[Janne Blomqvist]

Hi,

glibc 2.17 has renamed the exported but ostensibly private symbol
__secure_getenv to secure_getenv. The attached patch updates
libgfortran to first check for the presence of this new symbol. See
http://sourceware.org/glibc/wiki/Tips_and_Tricks/secure_getenv for
more details.

Committed as obvious.

2012-10-06  Janne Blomqvist  <j...@gcc.gnu.org>

        * configure.ac: Check for presence of secure_getenv.
        * libgfortran.h: Use HAVE_SECURE_GETENV.
        * Makefile.in: Regenerated.
        * aclocal.m4: Regenerated.
        * config.h.in: Regenerated.
        * configure: Regenerated.



-- 
Janne Blomqvist

secure_getenv.diff
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