Fix for build with automake v1.13.1

[Bart Polot]

Hi all,

I tried to build libgcrypt on a Linux Arch system, which ships aclocal (automake) 
version 1.13.1. This results in the following error (and many subsequent ones):

[...]
Running aclocal -I m4 ...
configure.ac:75: error: 'AM_CONFIG_HEADER': this macro is obsolete.
    You should use the 'AC_CONFIG_HEADERS' macro instead.

The proposed change fixed the problem. In case it helps here is the diff:

diff --git a/configure.ac b/configure.ac
index 7504d76..e67ec69 100644
--- a/configure.ac
+++ b/configure.ac
@@ -72,7 +72,7 @@ VERSION=$PACKAGE_VERSION
 
 AC_CONFIG_SRCDIR([src/libgcrypt.vers])
 AM_INIT_AUTOMAKE([])
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_LIBOBJ_DIR([compat])
 AC_CANONICAL_HOST

With this change the build process succeeds and the tests pass. On a debian 
system with automake 1.11.6 the change does not seem to break anything.

Happy hacking,
Bart Polot
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