Remove mkfifo() prototype

Author: jart

libc/calls/calls.h

@@ -129,7 +129,6 @@ int linkat(int, const char *, int, const char *, int) libcesque __read_only(2) _
 int mincore(void *, size_t, unsigned char *) libcesque __read_only(1) __write_only(3);
 int mkdir(const char *, unsigned) libcesque __read_only(1);
 int mkdirat(int, const char *, unsigned) libcesque __read_only(2);
-int mkfifo(const char *, unsigned);
 int mknod(const char *, unsigned, uint64_t) libcesque __read_only(1);
 int nice(int) libcesque;
 int open(const char *, int, ...) libcesque __read_only(1);