Use "getconf" to get correct LFS compile and link flags.
* Makefile (GPGME_CFLAGS): Added output of "getconf LFS_CFLAGS". (GPGME_LIBS): Added output of "getconf LFS_LIBS" and "getconf LFS_LDFLAGS". * plugins.d/mandos-client.c: Only define "_LARGEFILE_SOURCE" and "_FILE_OFFSET_BITS" if they are not already defined.