libgpgme: Take into account that gnupg and gnupg2 are mutual exclusive

Avoid that libgpgme can select the gnupg package although gnupg2 has
been already selected. Both packages are mutual exclusive and shouldn't
be selected at the same time.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgpgme/Config.in

@@ -2,7 +2,7 @@ config BR2_PACKAGE_LIBGPGME
 	bool "libgpgme"
 	depends on BR2_USE_MMU # libassuan
 	#gnupg is not needed to build, but at runtime.
-	select BR2_PACKAGE_GNUPG
+	select BR2_PACKAGE_GNUPG if !BR2_PACKAGE_GNUPG2
 	select BR2_PACKAGE_LIBGPG_ERROR
 	select BR2_PACKAGE_LIBASSUAN
 	help