Fix buildsytem to always include config.h.

- config.h must always be the first file to be included
- Use AM_CFLAGS and AM_LDFLAGS consistently and properly.

(Modified to disable build without largefile support etc
by Milan Broz <gmazyland@gmail.com>)

lib/utils_fips.c

@@ -23,7 +23,6 @@
 #include "libcryptsetup.h"
 #include "nls.h"
 #include "utils_fips.h"
-#include "config.h"
 
 #if !ENABLE_FIPS
 int crypt_fips_mode(void) { return 0; }