Fix 'make dist' so that it completes as "libspiro-0.2.20130930"

Noted that 'make dist' or 'make distcheck' would produce " in wrong place.
This was same problem as encountered with FontForge and Libuninameslist.

Also removed extra line under #ifndef _SPIRO_CONFIG_H
Resolved - #742438 libspiro-dev: Please add static library

Should work okay - Converted global variable 'int n=4' into a per-session
passed-in variable, so each PID sees default '4' unless they change their
session n value. Currently, there is no method to pass this variable into
libspiro, and Raph's documentation seems to show this value is optimal,
therefore used a #definition instead - see:

#ifndef N_IS
//int n = 4;
#define N_IS		4
#endif

If there is a good suggestion showing there is value in passing a number
other than 4, then libspiro will need an added function to pass in value.