feat: musl adapt for mksh & toybox

Change-Id: I552790d99c070f045c9300d71c1c69ed5de3ce7b

src/ctype/wcwidth.c

 #include <wchar.h>
-#include <unsupported_api.h>
 
 static const unsigned char table[] = {
 #include "nonspacing.h"
@@ -11,7 +10,6 @@ static const unsigned char wtable[] = {
 
 int wcwidth(wchar_t wc)
 {
-	unsupported_api(__FUNCTION__);
 	if (wc < 0xffU)
 		return (wc+1 & 0x7f) >= 0x21 ? 1 : wc ? -1 : 0;
 	if ((wc & 0xfffeffffU) < 0xfffe) {

src/dirent/fdopendir.c

@@ -4,15 +4,11 @@
 #include <errno.h>
 #include <stdlib.h>
 #include "__dirent.h"
-#include <unsupported_api.h>
 
 DIR *fdopendir(int fd)
 {
 	DIR *dir;
 	struct stat st;
-
-	unsupported_api(__FUNCTION__);
-
 	if (fstat(fd, &st) < 0) {
 		return 0;
 	}

src/fcntl/openat.c

 #include <fcntl.h>
 #include <stdarg.h>
 #include "syscall.h"
-#include <unsupported_api.h>
 
 int openat(int fd, const char *filename, int flags, ...)
 {
 	mode_t mode = 0;
 
-	unsupported_api(__FUNCTION__);
 	if ((flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE) {
 		va_list ap;
 		va_start(ap, flags);

src/misc/getrusage.c

 #include <sys/resource.h>
 #include <string.h>
 #include <errno.h>
-#include <unsupported_api.h>
 #include "syscall.h"
 
 int getrusage(int who, struct rusage *ru)
 {
 	int r;
-	unsupported_api(__FUNCTION__);
 #ifdef SYS_getrusage_time64
 	long long kru64[18];
 	r = __syscall(SYS_getrusage_time64, who, kru64);

src/passwd/getgr_r.c

@@ -47,6 +47,5 @@ int getgrnam_r(const char *name, struct group *gr, char *buf, size_t size, struc
 
 int getgrgid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
 {
-	unsupported_api(__FUNCTION__);
 	return getgr_r(0, gid, gr, buf, size, res);
 }

src/passwd/getpwent.c

-#include <unsupported_api.h>
 #include "pwf.h"
+#include <unsupported_api.h>
 
 static FILE *f;
 static char *line;

src/unistd/readlinkat.c

 #include <unistd.h>
-#include <unsupported_api.h>
 
 #include "syscall.h"
 
 ssize_t readlinkat(int fd, const char *restrict path, char *restrict buf, size_t bufsize)
 {
-	unsupported_api(__FUNCTION__);
 	return syscall(SYS_readlinkat, fd, path, buf, bufsize);
 }

src/unistd/unlinkat.c

 #include <unistd.h>
-#include <unsupported_api.h>
 
 #include "syscall.h"
 
 int unlinkat(int fd, const char *path, int flag)
 {
-	unsupported_api(__FUNCTION__);
 	return syscall(SYS_unlinkat, fd, path, flag);
 }