busybox: Fix -Werror=implicit-function-declaration

packages/busybox/coreutils-date.c.patch

@@ -0,0 +1,18 @@
+diff -u -r ../busybox-1.26.2/coreutils/date.c ./coreutils/date.c
+--- ../busybox-1.26.2/coreutils/date.c	2016-12-10 17:46:36.000000000 +0000
++++ ./coreutils/date.c	2017-07-06 22:15:17.528119028 +0000
+@@ -293,9 +293,14 @@
+ 		maybe_set_utc(opt);
+ 
+ 		/* if setting time, set it */
++#ifdef __ANDROID__
++		/* stime(2) is not available on Android and is not allowed anyway. */
++		bb_error_msg("can't set date: Operation not permitted");
++#else
+ 		if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
+ 			bb_perror_msg("can't set date");
+ 		}
++#endif
+ 	}
+ 
+ 	/* Display output */

packages/busybox/networking-hostname.c.patch

@@ -0,0 +1,22 @@
+diff -u -r ../busybox-1.26.2/networking/hostname.c ./networking/hostname.c
+--- ../busybox-1.26.2/networking/hostname.c	2016-12-10 18:46:36.000000000 +0100
++++ ./networking/hostname.c	2017-07-07 00:19:07.993535998 +0200
+@@ -58,11 +58,18 @@
+ 		}
+ 		if (ENABLE_FEATURE_CLEAN_UP)
+ 			config_close(parser);
++#ifdef __ANDROID__
++	} else {
++		/* sethostname() is not available on Android pre android-23 and not allowed anyway. */
++		bb_error_msg_and_die("can't set hostname: Operation not permitted");
++	}
++#else
+ 	} else if (sethostname(s, strlen(s))) {
+ //		if (errno == EPERM)
+ //			bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
+ 		bb_perror_msg_and_die("sethostname");
+ 	}
++#endif
+ }
+ 
+ /* Manpage circa 2009: