[PATCH libXfont] config: replace obsolete AM_CONFIG_HEADER with AC_CONFIG_HEADERS

[Gaetan Nadon]

There are 2 headers to generate. The first one (config.h)
is picked up by autoheader to generate the familiar config.h.in
input file. The others in the list (or in subsequent AC_CONFIG_HEADERS
macro calls) are generated from their existing matching template,
e.g. fontconf.h.in.

When multiple headers are listed in the same macro call,
they cannot be separated by a new line like we do in AC_OUTPUT.

Signed-off-by: Gaetan Nadon <memsize at videotron.ca>
---
 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 852124a..35ac80b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,8 @@ AC_INIT([libXfont],
 	1.4.1,
 	[https://bugs.freedesktop.org/enter_bug.cgi?product=xorg],
 	libXfont)
+# Autoheader generates config.h.in. No new lines allowed in the list.
+AC_CONFIG_HEADERS([config.h include/X11/fonts/fontconf.h])
 dnl
 dnl This is the package version number, not the shared library
 dnl version.  This same version number must appear in Xfont.h
@@ -33,8 +35,6 @@ dnl Yes, it is a pain to synchronize version numbers.  Unfortunately, it's
 dnl not possible to extract the version number here from Xfont.h
 dnl
 AM_INIT_AUTOMAKE([foreign dist-bzip2])
-AM_CONFIG_HEADER(config.h)
-AC_CONFIG_HEADERS([include/X11/fonts/fontconf.h])
 AM_MAINTAINER_MODE
 
 # Require xorg-macros: XORG_DEFAULT_OPTIONS
-- 
1.6.0.4

Given AM_CONFIG_HEADER is deprecated, the 2 headers are specified in AC_CONFIG_HEADERS.
The comment indicates that config.h is generated from config.h.in which is generated
by autoheader.

To workaround the autoheader bug, both headers are listed on a single line withn a comment
to the effect that new lines cannot be used as a separator.