contrib: added libunit-wasm and wasi-sysroot.

pkg/contrib/src/libunit-wasm/Makefile

@@ -0,0 +1,23 @@
+# libunit-wasm
+
+include $(dir $(abspath $(lastword $(MAKEFILE_LIST))))/version
+LIBUNIT_WASM_URL := https://github.com/nginx/unit-wasm.git
+
+PKGS += libunit-wasm
+
+DEPS_libunit-wasm = wasi-sysroot $(DEPS_wasi-sysroot)
+
+$(TARBALLS)/libunit-wasm-$(LIBUNIT_WASM_GITHASH).tar.xz:
+	$(call download_git,$(LIBUNIT_WASM_URL),,$(LIBUNIT_WASM_GITHASH))
+
+.sum-libunit-wasm: libunit-wasm-$(LIBUNIT_WASM_GITHASH).tar.xz
+	$(call check_githash,$(LIBUNIT_WASM_GITHASH))
+	touch $@
+
+libunit-wasm: libunit-wasm-$(LIBUNIT_WASM_GITHASH).tar.xz
+	$(UNPACK)
+	$(MOVE)
+
+.libunit-wasm: libunit-wasm
+	cd $< && CFLAGS= make WASI_SYSROOT=$(TOPSRC)wasi-sysroot V=1 libunit-wasm
+	touch $@