add lz4 (#149)

packages/l/lz4/xmake.lua

@@ -0,0 +1,30 @@
+package("lz4")
+
+    set_homepage("https://www.lz4.org/")
+    set_description("LZ4 - Extremely fast compression")
+
+    set_urls("https://github.com/lz4/lz4/archive/$(version).tar.gz",
+             "https://github.com/lz4/lz4.git")
+    add_versions("v1.9.3", "030644df4611007ff7dc962d981f390361e6c97a34e5cbc393ddfbe019ffe2c1")
+
+    on_install(function (package)
+        io.writefile("xmake.lua", [[
+            add_rules("mode.debug", "mode.release")
+            target("lz4")
+                set_kind("$(kind)")
+                add_files("lib/*.c")
+                add_headerfiles("lib/lz4.h")
+                if is_kind("shared") and is_plat("windows") then
+                    add_defines("LZ4_DLL_EXPORT")
+                end
+        ]])
+        local configs = {}
+        if package:config("shared") then
+            configs.kind = "shared"
+        end
+        import("package.tools.xmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("LZ4_compress_default", {includes = {"lz4.h"}}))
+    end)