[Midnightbsd-cvs] src: src/include: add feature_present(3) to test for kernel features.

[laffer1 at midnightbsd.org]

Log Message:
-----------
add feature_present(3) to test for kernel features.

Modified Files:
--------------
    src/include:
        unistd.h (r1.3 -> r1.4)
        (http://cvsweb.midnightbsd.org/src/include/unistd.h?r1=1.3&r2=1.4)
    src/lib/libc/gen:
        Makefile.inc (r1.5 -> r1.6)
        (http://cvsweb.midnightbsd.org/src/lib/libc/gen/Makefile.inc?r1=1.5&r2=1.6)
        Symbol.map (r1.4 -> r1.5)
        (http://cvsweb.midnightbsd.org/src/lib/libc/gen/Symbol.map?r1=1.4&r2=1.5)

Added Files:
-----------
    src/lib/libc/gen:
        feature_present.3 (r1.1)
        (http://cvsweb.midnightbsd.org/src/lib/libc/gen/feature_present.3?rev=1.1&content-type=text/x-cvsweb-markup)
        feature_present.c (r1.1)
        (http://cvsweb.midnightbsd.org/src/lib/libc/gen/feature_present.c?rev=1.1&content-type=text/x-cvsweb-markup)