porting里新增接口sched_setscheduler，修改musl_src.gni，新增对应测试用例并修改test_src_functional.gni

Signed-off-by: caifuzhou <504631861@qq.com>

libc-test/src/functional/sched_setscheduler.c

+#include <sched.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+#include "test.h"
+
+#define TEST(c) ((!c) ? 1 : (t_error(#c" failed: %s" ,strerror(errno)),0))
+
+int main(int argc,char *argv[])
+{
+    struct sched_param param;
+    int maxpri;
+
+    maxpri = sched_get_priority_max(SCHED_FIFO);
+    if(maxpri == -1) 
+    {
+        perror("get priority failed");
+        return -1;
+    }
+    param.sched_priority = maxpri;
+    TEST(sched_setscheduler(getpid(), SCHED_FIFO, &param));
+    TEST(!(sched_getscheduler(getpid()) == SCHED_FIFO));
+    
+    return 0;
+}
+

libc-test/src/functional/test_src_functional.gni

@@ -58,6 +58,7 @@ functional_list = [
   "strtol",
   "strtold",
   "swprintf",
+  "sched_setscheduler",
   "tgmath",
   "time",
   "tls_align",

musl_src.gni

@@ -1838,6 +1838,7 @@ musl_src_porting_file = [
   "src/multibyte/wcsnrtombs.c",
   "src/network/inet_legacy.c",
   "src/passwd/getspnam_r.c",
+  "src/sched/sched_setscheduler.c",
   "src/thread/arm/clone.s",
   "src/thread/arm/syscall_cp.s",
 ]

porting/linux/user/src/sched/sched_setscheduler.c

+#include <sched.h>
+#include <errno.h>
+#include "syscall.h"
+#include "pthread_impl.h"
+
+int sched_setscheduler(pid_t pid, int sched, const struct sched_param *param)
+{
+	int r;
+	if (!param) {
+		r = -EINVAL;
+		goto exit;
+	}
+
+	r = __syscall(SYS_sched_setscheduler, pid, sched, param);//, MUSL_TYPE_PROCESS
+;
+exit:
+
+
+	return __syscall_ret(r);
+}
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