elektra: explicitly disable gpgme plugin

With the addition of gpgme-config per 91a6168, elektra has started
detecting the presence of gpgme and is automatically building the
plugin. Even though it's not being installed, it has broken the build on
CONFIG_ARCH="arc" due to some LFS weirdness with uClibc.

Explicitly disable it since the package in its current form doesn't
expect it to be built.

Signed-off-by: Matt Merhar <mattmerhar@protonmail.com>

libs/elektra/Makefile

@@ -297,7 +297,7 @@ CMAKE_OPTIONS = \
 	-DKDB_DEFAULT_RESOLVER=resolver_fm_pb_b \
 	-DKDB_DEFAULT_STORAGE=ini \
 	-DENABLE_OPTIMIZATIONS=OFF \
-	-DPLUGINS="ALL;-multifile;-simpleini;-internalnotification" \
+	-DPLUGINS="ALL;-gpgme;-internalnotification;-multifile;-simpleini" \
 	-DIconv_INCLUDE_DIR="$(ICONV_PREFIX)/include" \
 	-DIconv_LIBRARY="$(ICONV_PREFIX)/lib/libiconv.$(if $(CONFIG_BUILD_NLS),so,a)" \
 	-DBINDINGS="MAINTAINED;-intercept_env;-intercept_fs;-io_uv;-io_ev;-io_glib"