[PATCH] manual: Update the _ISOC99_SOURCE description.

[Rical Jasan]

The current description refers to ISO C99 not being widely adopted,
which it is believed to be now.

	* manual/creature.texi (_ISOC99_SOURCE): Update the dated
	description.
---
 manual/creature.texi | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/manual/creature.texi b/manual/creature.texi
index 483bf85ad7..fe7a7790a2 100644
--- a/manual/creature.texi
+++ b/manual/creature.texi
@@ -167,10 +167,9 @@ This macro was introduced as part of the Large File Support extension
 
 @defvr Macro _ISOC99_SOURCE
 @standards{GNU, (none)}
-Until the revised @w{ISO C} standard is widely adopted the new features
-are not automatically enabled.  @Theglibc{} nevertheless has a complete
-implementation of the new standard and to enable the new features the
-macro @code{_ISOC99_SOURCE} should be defined.
+If this macro is defined, features from ISO C99 are included.  Since
+these features are included by default, this macro is mostly relevant
+when the compiler uses an earlier language version.
 @end defvr
 
 @defvr Macro _ISOC11_SOURCE
-- 
2.16.1