Include <fcntl.h> instead of <sys/fcntl.h>

<fcntl.h> is POSIX. On Linux, <sys/fcntl.h> simply includes
<fcntl.h>, so there should be on difference. On Android
likewise, except that there is some more stuff. QNX has
only <fcntl.h>.

https://bugs.freedesktop.org/show_bug.cgi?id=63423

src/journal/cat.c

@@ -25,7 +25,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
-#include <sys/fcntl.h>
+#include <fcntl.h>
 
 #include <systemd/sd-journal.h>
 

src/libsystemd-daemon/sd-daemon.c

@@ -32,11 +32,7 @@
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/un.h>
-#ifdef __BIONIC__
-#  include <linux/fcntl.h>
-#else
-#  include <sys/fcntl.h>
-#endif
+#include <fcntl.h>
 #include <netinet/in.h>
 #include <stdlib.h>
 #include <errno.h>