Improve my fixes to 2000/natori

When Landon initially tried getting it to work he ended up making the
include files in the Makefile (-include ...) to restore it to be a
one-liner but this was actually an error as it was not a one-liner but
rather a best small program; the original code has the #includes in the
source file.

At the same time I made the code itself one-line as it was indeed one
line (the source of the problem, of course).

Now the fixed code (segfaulted with gcc, failed to compile with clang),
both original and alt version (southern hemisphere: based on the
author's remarks but with my fixes applied) that I added, looks more
like the original.

2000/natori/Makefile

@@ -62,7 +62,7 @@ CDEFINE= -Wno-error -Wno-implicit-function-declaration -Wno-implicit-int \
 
 # Include files that are needed to compile
 #
-CINCLUDE= -include stdlib.h -include math.h
+CINCLUDE=
 
 # Optimization
 #