23.0.60; Warnings with Autoconf 2.62

[Yavor Doganov]

AC_AIX and AC_GNU_SOURCE are obsolete as of Autoconf 2.62, which
results in a few warnings:

configure.in:856: warning: AC_COMPILE_IFELSE was called before 
AC_USE_SYSTEM_EXTENSIONS
../../lib/autoconf/specific.m4:385: AC_USE_SYSTEM_EXTENSIONS is expanded from...
../../lib/autoconf/specific.m4:331: AC_GNU_SOURCE is expanded from...
configure.in:856: the top level
configure.in:856: warning: AC_RUN_IFELSE was called before 
AC_USE_SYSTEM_EXTENSIONS
configure.in:856: warning: AC_COMPILE_IFELSE was called before 
AC_USE_SYSTEM_EXTENSIONS
[...]

AC_USE_SYSTEM_EXTENSIONS was introduced in 2.60 and configure.in
already requires 2.61, so this change should be safe.


2008-04-15  Yavor Doganov  <address@hidden>  (tiny change)

        * configure.in: Replace the obsolete macros AC_AIX and
        AC_GNU_SOURCE with AC_USE_SYSTEM_EXTENSIONS.

--- configure.in        15 апр 2008 12:24:38 +0300      1.520
+++ configure.in        15 апр 2008 12:27:54 +0300      
@@ -852,8 +852,7 @@
 fi
 
 dnl checks for Unix variants
-AC_AIX
-AC_GNU_SOURCE
+AC_USE_SYSTEM_EXTENSIONS
 
 ### Use -Wno-pointer-sign if the compiler supports it
 AC_MSG_CHECKING([whether gcc understands -Wno-pointer-sign])