busybox: do not try to chown() files when running `crontab -e`

Issue https://github.com/termux/termux-packages/issues/4837.

packages/busybox/0008-miscutils-crontab.patch

@@ -1,6 +1,6 @@
 diff -uNr busybox-1.31.1/miscutils/crontab.c busybox-1.31.1.mod/miscutils/crontab.c
 --- busybox-1.31.1/miscutils/crontab.c	2019-06-10 13:50:53.000000000 +0300
-+++ busybox-1.31.1.mod/miscutils/crontab.c	2019-11-11 22:08:19.115118798 +0200
++++ busybox-1.31.1.mod/miscutils/crontab.c	2020-01-29 23:25:22.817488323 +0200
 @@ -53,10 +53,12 @@
  
  	/* CHILD - change user and run editor */
@@ -14,7 +14,15 @@ diff -uNr busybox-1.31.1/miscutils/crontab.c busybox-1.31.1.mod/miscutils/cronta
  	ptr = getenv("VISUAL");
  	if (!ptr) {
  		ptr = getenv("EDITOR");
-@@ -167,7 +169,8 @@
+@@ -158,7 +160,6 @@
+ 		/* No O_EXCL: we don't want to be stuck if earlier crontabs
+ 		 * were killed, leaving stale temp file behind */
+ 		src_fd = xopen3(tmp_fname, O_RDWR|O_CREAT|O_TRUNC, 0600);
+-		fchown(src_fd, pas->pw_uid, pas->pw_gid);
+ 		fd = open(pas->pw_name, O_RDONLY);
+ 		if (fd >= 0) {
+ 			bb_copyfd_eof(fd, src_fd);
+@@ -167,7 +168,8 @@
  		}
  		close_on_exec_on(src_fd); /* don't want editor to see this fd */
  		edit_file(pas, tmp_fname);

packages/busybox/build.sh

@@ -2,7 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://busybox.net/
 TERMUX_PKG_DESCRIPTION="Tiny versions of many common UNIX utilities into a single small executable"
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_VERSION=1.31.1
-TERMUX_PKG_REVISION=4
+TERMUX_PKG_REVISION=5
 TERMUX_PKG_SRCURL=https://busybox.net/downloads/busybox-${TERMUX_PKG_VERSION}.tar.bz2
 TERMUX_PKG_SHA256=d0f940a72f648943c1f2211e0e3117387c31d765137d92bd8284a3fb9752a998
 TERMUX_PKG_BUILD_IN_SRC=true