stubby: remove libidn2 and libunwind dependencies

There's no good way to get rid of these, so just delete the cmake files.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/stubby/Makefile

@@ -6,7 +6,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=stubby
 PKG_VERSION:=0.4.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/getdnsapi/$(PKG_NAME)
@@ -17,8 +17,6 @@ PKG_MAINTAINER:=Jonathan Underwood <jonathan.underwood@gmail.com>
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=COPYING
 
-CMAKE_INSTALL:=1
-
 include $(INCLUDE_DIR)/package.mk
 include ../../devel/ninja/ninja-cmake.mk
 
@@ -47,6 +45,11 @@ define Package/stubby/conffiles
 /etc/config/stubby
 endef
 
+define Build/Prepare
+	$(call Build/Prepare/Default)
+	rm $(PKG_BUILD_DIR)/cmake/modules/FindLibidn2.cmake $(PKG_BUILD_DIR)/cmake/modules/FindLibunbound.cmake
+endef
+
 define Package/stubby/install
 	$(INSTALL_DIR) $(1)/usr/sbin
 	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/bin/stubby $(1)/usr/sbin/stubby