package/cryptopp: don't build cryptest.exe

Replace install target by install-lib target to avoid building and
installing cryptest.exe

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/cryptopp/cryptopp.mk

@@ -24,7 +24,7 @@ define HOST_CRYPTOPP_BUILD_CMDS
 endef
 
 define HOST_CRYPTOPP_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) PREFIX=$(HOST_DIR) install
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) PREFIX=$(HOST_DIR) install-lib
 endef
 
 $(eval $(host-generic-package))