jwasm: add package (#5261)

* jwasm: add package

* limit plat

* Update xmake.lua

* Update xmake.lua

packages/j/jwasm/xmake.lua

@@ -0,0 +1,34 @@
+package("jwasm")
+    set_kind("binary")
+    set_homepage("https://github.com/JWasm/JWasm")
+    set_description("JWasm continuation")
+    set_license("JWasm")
+
+    add_urls("https://github.com/JWasm/JWasm.git")
+    add_versions("2025.01.10", "a5c4ea03cc0545a15d81a354251b5f534bef7a1b")
+
+    on_install(function (package)
+        if package:is_plat("mingw", "msys") then
+            io.replace("memalloc.c", "#include <sys/mman.h>", "", {plain = true})
+        end
+
+        io.writefile("xmake.lua", [[
+            add_rules("mode.debug", "mode.release")
+            target("jwasm")
+                set_kind("binary")
+                add_files("*.c|trmem.c")
+                add_includedirs("H")
+                add_defines("DEBUG_OUT")
+                if is_plat("windows", "mingw", "msys") then
+                    add_defines("__NT__")
+                else
+                    add_defines("__UNIX__")
+                end
+        ]])
+        import("package.tools.xmake").install(package)
+    end)
+
+    on_test(function (package)
+        -- os.vrun("jwasm -h") -- return 1
+        assert(os.isexec(path.join(package:installdir("bin"), "jwasm" .. (is_host("windows") and ".exe" or ""))))
+    end)