busybox: fix setting the kernel timezone

The settimeofday() syscall wrapper provided by musl filters out the timezone
argument, breaking the ability to set the kernel timezone through the function.

Adjust busybox patch to issue the syscall directly in order to circumvent the
problem.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

package/utils/busybox/patches/250-date-k-flag.patch

@@ -8,15 +8,19 @@
  //usage:     "\n"
  //usage:     "\nRecognized TIME formats:"
  //usage:     "\n	hh:mm[:ss]"
-@@ -138,6 +139,7 @@
+@@ -138,9 +139,8 @@
  //usage:       "Wed Apr 12 18:52:41 MDT 2000\n"
  
  #include "libbb.h"
+-#if ENABLE_FEATURE_DATE_NANO
+-# include <sys/syscall.h>
+-#endif
 +#include <sys/time.h>
- #if ENABLE_FEATURE_DATE_NANO
- # include <sys/syscall.h>
- #endif
-@@ -148,8 +150,9 @@ enum {
++#include <sys/syscall.h>
+ 
+ enum {
+ 	OPT_RFC2822   = (1 << 0), /* R */
+@@ -148,8 +148,9 @@ enum {
  	OPT_UTC       = (1 << 2), /* u */
  	OPT_DATE      = (1 << 3), /* d */
  	OPT_REFERENCE = (1 << 4), /* r */
@@ -28,7 +32,7 @@
  };
  
  static void maybe_set_utc(int opt)
-@@ -167,12 +170,15 @@ static const char date_longopts[] ALIGN1
+@@ -167,12 +168,15 @@ static const char date_longopts[] ALIGN1
  	/*	"universal\0" No_argument       "u" */
  		"date\0"      Required_argument "d"
  		"reference\0" Required_argument "r"
@@ -44,7 +48,7 @@
  	struct timespec ts;
  	struct tm tm_time;
  	char buf_fmt_dt2str[64];
-@@ -187,7 +193,7 @@ int date_main(int argc UNUSED_PARAM, cha
+@@ -187,7 +191,7 @@ int date_main(int argc UNUSED_PARAM, cha
  	opt_complementary = "d--s:s--d"
  		IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
  	IF_LONG_OPTS(applet_long_options = date_longopts;)
@@ -53,7 +57,7 @@
  			IF_FEATURE_DATE_ISOFMT("I::D:"),
  			&date_str, &date_str, &filename
  			IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
-@@ -244,6 +250,31 @@ int date_main(int argc UNUSED_PARAM, cha
+@@ -244,6 +248,31 @@ int date_main(int argc UNUSED_PARAM, cha
  	if (*argv)
  		bb_show_usage();
  
@@ -64,7 +68,7 @@
 +
 +		/* workaround warp_clock() on first invocation */
 +		memset(&tz, 0, sizeof(tz));
-+		settimeofday(NULL, &tz);
++		syscall(SYS_settimeofday, NULL, &tz);
 +
 +		memset(&tz, 0, sizeof(tz));
 +#ifdef __USE_MISC
@@ -73,7 +77,7 @@
 +		tz.tz_minuteswest = -(tm_time.__tm_gmtoff / 60);
 +#endif
 +
-+		if (settimeofday(NULL, &tz))
++		if (syscall(SYS_settimeofday, NULL, &tz))
 +		{
 +			bb_perror_msg("can't set kernel time zone");
 +			return EXIT_FAILURE;