argz.m4: error_t handling wrt argz.h and errno.h

[Mike Frysinger]

the argz.m4 header checks to see if error_t is defined, but only does so by 
including the argz.h header.  if you try to build on a system that does 
provide error_t, but not argz.h, the argz replacement module fails to build.  
on glibc systems, error_t is defined in errno.h.  perhaps the gl_FUNC_ARGZ 
should be checking to see if errno.h exists and if so, including it.
-mike

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