autoconf enhancement for Interix

[Martin Koeppe]

Hi all,

to better support Interix aka MS Services for Unix[1], I would like to 
suggest applying the attached diff. Interix requires, such as AIX,
#define _ALL_SOURCE 1 to enable all functions in the system headers.
To not have to change all the configure.ac files around, I suggest to 
keep the name at AC_AIX.

[1] http://www.microsoft.com/windows/sfu/

Thanks for consideration

Martin

specific.m4.diff
Description: Text document