add libsv (#948)

packages/l/libsv/xmake.lua

@@ -0,0 +1,18 @@
+package("libsv")
+    set_homepage("https://github.com/uael/sv")
+    set_description("libsv - Public domain cross-platform semantic versioning in c99")
+
+    add_urls("https://github.com/uael/sv.git")
+    add_versions("2021.11.27", "10ee6a807466a5e61309201caea360a113ad3862")
+
+    on_install(function (package)
+        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("semver(0,0)", {includes = "semver.h"}))
+    end)