Fix compilation of the imported config_file.c parser

Fix compilation of the imported config_file.c parser

Include additional missing header files for proper function prototypes,
define TRUE and FALSE, and declare krb5_clear_error_message as unused
so that the config_file.c will compile and pass --enable-checking.

Make the build depend on krb5_locl.h.

Change-Id: I25a35098aa81c9d2a0efea48257dcb958602c785
Reviewed-on: http://gerrit.openafs.org/2040
Tested-by: Russ Allbery <rra@stanford.edu>
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Tested-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>