gcr: depends on gnupg-native

It fails to build gcr if no commmand gpg on build host:

| meson.build:44:0: ERROR: Program(s) ['gpg2', 'gpg'] not found or not executable

Add dependency gnupg-native to fix the error.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
(cherry picked from commit e4a6eda4c246b2bca059defed796bdab19a7ab5f)
Signed-off-by: Steve Sakoman <steve@sakoman.com>