ulib Add vfsavailmounts() and vfsmountstat()

ulib/system/system.c

@@ -39,6 +39,14 @@ int32_t vfsunmount(char *mountpoint) {
   return syscall(SYS_VFSUNMOUNT, (uint64_t)mountpoint, 0, 0, 0, 0, 0);
 }
 
+int32_t vfsavailmounts(VfsAvailMounts *availmounts) {
+  return syscall(SYS_VFSAVAILMOUNTS, (uint64_t)availmounts, 0, 0, 0, 0, 0);
+}
+
+int32_t vfsmountstat(VfsMountStat *statbuf, char *label) {
+  return syscall(SYS_VFSMOUNTSTAT, (uint64_t)statbuf, (uint64_t)label, 0, 0, 0, 0);
+}
+
 int32_t ipc_piperead(PID_t pid, uint64_t pipenum, uint8_t *const buffer, size_t len) {
   return syscall(SYS_IPC_PIPEREAD, (uint64_t)pid, (uint64_t)pipenum, (uint64_t)buffer, (uint64_t)len, 0, 0);
 }