notify: cleanups

* move set_nonblock{,ing}() into utils.c since we use it
elsewhere, too
* add proper error checking to set_nonblocking()
* use os_compat.h instead of individually #includ-ing system headers

git-svn-id: https://svn.musicpd.org/mpd/trunk@7217 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/utils.h

@@ -79,4 +79,6 @@ mpd_malloc void *xcalloc(size_t nmemb, size_t size);
 
 char *parsePath(char *path);
 
+int set_nonblocking(int fd);
+
 #endif