src: Fix Makefile for BSD make.
* src/Makefile.am (BUILT_SOURCES): Add srcdir to err-sources.h and err-codes.h. (CLEANFILES): Move err-sources.h and err-codes.h to... (MAINTAINERCLEANFILES): ... this new target. (gpg_error_LDADD): Remove ./ to generate libgpg-error.la.
BSD make is not kind enough to mix path and target.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>