leveldb: install memenv static library and header

The project builds a tiny static library that consists of a single
symbol which creates an in-memory LevelDB database.

That library is not installed by default and may be used by other
projects.

This commit installs in the staging directory the libmemenv.a static
library and the memenv.h header file.

Signed-off-by: Gaël PORTAY <gael.portay@collabora.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/leveldb/leveldb.mk

@@ -25,6 +25,8 @@ define LEVELDB_INSTALL_STAGING_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE1) \
 		INSTALL_ROOT=$(STAGING_DIR) INSTALL_PREFIX=/usr \
 		$(LEVELDB_MAKE_ARGS) -C $(@D) install
+	$(INSTALL) -D -m 0644 $(@D)/out-static/libmemenv.a $(STAGING_DIR)/usr/lib/libmemenv.a
+	$(INSTALL) -D -m 0644 $(@D)/helpers/memenv/memenv.h $(STAGING_DIR)/usr/include/helpers/memenv/memenv.h
 endef
 
 define LEVELDB_INSTALL_TARGET_CMDS