[Libvir] using gnulib: starting with the physmem and getaddrinfo modules

[Richard W.M. Jones]

More modules we could use (all for MinGW / Windows):

	-	-	-

  - vasprintf

     For asprintf which we use all over the place.

  - gettext

     MinGW lacks <libintl.h> and any gettext function.  I thought that 
gettextize was supposed to supply all the code needed to implement 
these?  Anyhow, it doesn't seem to.

  - strndup & strsep

     Non-standard functions, used all over.

  - fcntl [LGPLv3]

     The gnulib one fixes all the flags which are missing from Windows

  - sys_stat

     As above, but for S_* (Unix modes) macros

  - readlink [LGPLv3]

     This explicitly acts as a substitute for this system call on MinGW, 
according to the documentation anyway.

   - poll

      Only applicable if we want to build libvirtd on Windows, which 
isn't very useful at the moment.

	-	-	-

The above would fix about 80-90% of the porting problems with MinGW, 
enabling us to have a natively compiled Windows binary and DLL.

All of the modules mentioned above are 'LGPLv2' except where mentioned. 
  I haven't checked the dependencies in detail however.

Rich.

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