debloat: use __syscall instead of syscall where possible

[musl] / src / stdio / flockfile.c

#include "stdio_impl.h"
#include "pthread_impl.h"

void flockfile(FILE *f)
{
        if (!libc.lockfile) {
                pthread_self();
                libc.lockfile = __lockfile;
        }
        __lockfile(f);
}