[gimp] configure.ac: Do not use AC_ISC_POSIX macro

[Javier JardÃn <jjardon src gnome org>]

commit c581b6147ee8506d73e6aa067cd91651f6e11df4
Author: Javier JardÃn <jjardon gnome org>
Date:   Mon Oct 17 01:52:54 2011 +0100

    configure.ac: Do not use AC_ISC_POSIX macro
    
    Sun dropped support for the obsolete INTERACTIVE
    Systems Corporation Unix on 2006-07-23. New programs need not use
    this macro.

 configure.ac |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index a3ad57d..b60e569 100644
--- a/configure.ac
+++ b/configure.ac
@@ -268,7 +268,6 @@ AC_SUBST(WINDRES)
 ###############
 
 # Checks for programs.
-AC_ISC_POSIX
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET