i-ring: needs stdbool

[Bruno Haible]

The i-ring.h file includes <stdbool.h>. Therefore it should depend on
the 'stdbool' module. Currently it gives an error on Solaris 10 for example:

cc -xarch=v9 -O -DHAVE_CONFIG_H -I. -I..      -g -c i-ring.c
"/usr/include/stdbool.h", line 42: #error: "Use of <stdbool.h> is valid only in 
a c99 compilation environment."
cc: acomp failed for i-ring.c

I'm applying this:


2007-03-11  Bruno Haible  <address@hidden>

        * modules/i-ring (Depends-on): Add stdbool.

*** modules/i-ring      18 Nov 2006 11:14:13 -0000      1.2
--- modules/i-ring      11 Mar 2007 23:23:36 -0000
***************
*** 7,12 ****
--- 7,13 ----
  m4/i-ring.m4
  
  Depends-on:
+ stdbool
  verify
  
  configure.ac: