Do not include 'features.h' to make use feature test macro's
Do not include 'features.h' to make use feature test macro's

The feature test macros (such as _POSIX_C_SOURCE) are somewhat standard/
portable. 'features.h' is a Linux/glibc thing and should not be included
directly. It is automatically included by other header files (in this case
<sys/select.h>) as required. This is documented in the NOTES section of the
feature_test_macros manpage on linux. Verified with Silas Sila that this
also indeed behaves as expected (uses pselect) on NetBSD.

raboof/notion,knixeur/notion,neg-serg/notion,dkogan/notion,knixeur/notion,p5n/notion,dkogan/notion.xfttest,anoduck/notion,dkogan/notion,neg-serg/notion,raboof/notion,raboof/notion,dkogan/notion,dkogan/notion,anoduck/notion,p5n/notion,neg-serg/notion,knixeur/notion,anoduck/notion,knixeur/notion,knixeur/notion,p5n/notion,dkogan/notion,p5n/notion,p5n/notion,dkogan/notion.xfttest,raboof/notion,dkogan/notion.xfttest,dkogan/notion.xfttest,anoduck/notion,anoduck/notion,neg-serg/notion