Summary:
GCC emits a pretty amusing warning when there are apostrophes in a #warning:
```warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix]```
Reword the warning to avoid this, and be more consistent with other warnings in libc++.
Reviewers: danalbert
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D7818
llvm-svn: 230298
#define _LIBCPP_ELAST _sys_nerr
#else
// Warn here so that the person doing the libcxx port has an easier time:
-#warning This platform's ELAST hasn't been ported yet
+#warning ELAST for this platform not yet implemented
#endif
#endif // _LIBCPP_CONFIG_ELAST