Fix issue #2: There is no configure binary and get some statements while building it.

There's no reason to keep a configure binary in source control. I added the
necessary steps to create it in the README.

Makefile.am

@@ -1,3 +1,4 @@
+ACLOCAL_AMFLAGS = -I m4
 SUBDIRS = libcpuid cpuid_tool tests
 
 pkgconfigdir = $(libdir)/pkgconfig

README

@@ -4,3 +4,23 @@ libcpuid
 libcpuid provides CPU identification for the x86 (and x86_64).
 For details about the programming API, please see the docs
 on the project's site (http://libcpuid.sourceforge.net/)
+
+    Configuring after checkout
+    --------------------------
+
+        Under linux, where you download the sources, there's no
+    configure script to run. This is because it isn't a good practice to keep
+    such scripts in a source control system. To create it, you need to run the
+    following commands once, after you checkout the libcpuid sources
+    from github:
+
+        1. run "libtoolize"
+        2. run "autoreconf --install"
+
+        You need to have autoconf, automake and libtool installed.
+
+        After that you can run "./configure" and "make" - this will build
+    the library.
+
+        "make dist" will create a tarball (with "configure" inside) with the
+    sources.

configure.ac

@@ -1,6 +1,7 @@
 AC_INIT([libcpuid CPU Identification library], [0.2.0], [libcpuid-devel@lists.sourceforge.net], [libcpuid])
 AC_CONFIG_SRCDIR([libcpuid/libcpuid.h])
 AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([-Wall dist-bzip2 dist-zip foreign])
 
 dnl Versioning scheme shamelessly copied from libexif.