* configure.ac: Add new component.
* tests/Makefile.am: Likewise.
* tests/gpgscm/Makefile.am: New file.
* tests/gpgscm/ffi-private.h: Likewise.
* tests/gpgscm/ffi.c: Likewise.
* tests/gpgscm/ffi.h: Likewise.
* tests/gpgscm/ffi.scm: Likewise.
* tests/gpgscm/lib.scm: Likewise.
* tests/gpgscm/main.c: Likewise.
* tests/gpgscm/private.h: Likewise.
* tests/gpgscm/repl.scm: Likewise.
* tests/gpgscm/scheme-config.h: Likewise.
* tests/gpgscm/t-child.c: Likewise.
* tests/gpgscm/t-child.scm: Likewise.
* tests/gpgscm/tests.scm: Likewise.