feat: Add pacakge 'volk' (#174)

volk is a meta-loader for Vulkan, add it to xmake-repo

log: Add file xmake.lua in packages/v/volk/

packages/v/volk/xmake.lua

@@ -0,0 +1,41 @@
+package("volk")
+
+    set_homepage("https://github.com/zeux/volk")
+    set_description("volk is a meta-loader for Vulkan")
+    set_license("MIT")
+
+    add_urls("https://github.com/zeux/volk/archive/$(version).tar.gz")
+    add_versions("1.2.162", "ac4d9d6e88dee5a83ad176e2da57f1989ca2c6df155a0aeb5e18e9471aa4d777")
+
+    add_deps("cmake", "vulkan-headers")
+
+    if is_plat("linux") then
+        add_syslinks("dl")
+    end
+
+    on_install("windows", "linux", "macosx", function (package)
+        import("package.tools.cmake").install(package)
+    end)
+
+    on_install("windows", "linux", "macosx", function (package)
+        local configs = {}
+        if package:config("shared") then
+            table.insert(configs, "--enable-shared=yes")
+        else
+            table.insert(configs, "--enable-shared=no")
+        end
+        import("package.tools.cmake").build(package, configs, {buildir = "build", packagedeps = "vulkan-headers"})
+        if package:is_plat("windows") then
+            os.trycp("build/*.lib", package:installdir("lib"))
+            os.trycp("build/*.dll", package:installdir("bin"))
+        else
+            os.trycp("build/*.a", package:installdir("lib"))
+            os.trycp("build/*.so", package:installdir("lib"))
+        end
+        os.cp("*.h", package:installdir("include"))
+    end)
+
+    on_test(function (package)
+        assert(package:has_cxxfuncs("volkInitialize", {configs = {languages = "c++14"}, includes = "volk.h"}))
+    end)
+