build: Fix capnp package build for Android

Author: hebasto

depends/packages/capnp.mk

@@ -6,8 +6,13 @@ $(package)_file_name=$(native_$(package)_file_name)
 $(package)_sha256_hash=$(native_$(package)_sha256_hash)
 $(package)_dependencies=native_$(package)
 
+define $(package)_set_vars :=
+$(package)_config_opts := --with-external-capnp
+$(package)_config_opts_android := --disable-shared
+endef
+
 define $(package)_config_cmds
-  $($(package)_autoconf) --with-external-capnp
+  $($(package)_autoconf)
 endef
 
 define $(package)_build_cmds