Merge "Test __GLIBC__ is defined before using its value."

/*

 * Define to 1 if <stdlib.h> provides qsort_r() with a GNU style function prototype.

 */

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8)

#if defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8))

#define HAVE_GNU_QSORT_R 1

#else

#define HAVE_GNU_QSORT_R 0