[gtk+] configure.ac: Remove some obsolescent macros

[Javier Jardón <jjardon src gnome org>]

commit 899019d56ac87e631f1f1e2e592aa58047c109d3
Author: Javier Jardón <jjardon gnome org>
Date:   Sun Feb 6 00:38:38 2011 +0000

    configure.ac: Remove some obsolescent macros
    
    AC_C_CONST: current C compilers support const
    AC_TYPE_SYGNAL: obsolete when assuming C89 or better
    AC_HEADER_STDC: current systems have conforming header files

 configure.ac |    7 -------
 1 files changed, 0 insertions(+), 7 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 71589c1..7d941f3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -703,14 +703,7 @@ saved_cflags="$CFLAGS"
 saved_ldflags="$LDFLAGS"
 
 
-# Checks for header files.
-AC_HEADER_STDC
-
-# Checks for typedefs, structures, and compiler characteristics.
-AC_C_CONST
-
 # Checks for library functions.
-AC_TYPE_SIGNAL
 AC_FUNC_MMAP
 
 AC_CHECK_FUNCS(mallinfo)