Define __STDC_WANT_IEC_60559_TYPES_EXT__ in tst-strtod-round-skeleton.c [committed]

[Joseph Myers]

The tst-strtod-round-skeleton.c conditionals relating to handling of
_Float64x require associated <float.h> macros, which requires
__STDC_WANT_IEC_60559_TYPES_EXT__ to be defined before <float.h> is
included if _Float64x is supported.  This patch adds the necessary
definition.

Tested for x86_64, including in conjunction with _Float64x support
patches.  Committed.

2017-11-24  Joseph Myers  <joseph@codesourcery.com>

	* stdlib/tst-strtod-round-skeleton.c
	(__STDC_WANT_IEC_60559_TYPES_EXT__): Define before including
	headers.

diff --git a/stdlib/tst-strtod-round-skeleton.c b/stdlib/tst-strtod-round-skeleton.c
index 763c9ce..05d8a4c 100644
--- a/stdlib/tst-strtod-round-skeleton.c
+++ b/stdlib/tst-strtod-round-skeleton.c
@@ -20,6 +20,7 @@
 /* Defining _LIBC_TEST ensures long double math functions are
    declared in the headers.  */
 #define _LIBC_TEST 1
+#define __STDC_WANT_IEC_60559_TYPES_EXT__
 #include <fenv.h>
 #include <float.h>
 #include <math.h>

-- 
Joseph S. Myers
joseph@codesourcery.com