feat: improve GN tool for build/install commands

- rename option from argv to target, follows usage of ninja.
- add option in install command.

Author: poirierlouis

xmake/modules/package/tools/gn.lua

@@ -124,8 +124,8 @@ function build(package, configs, opt)
 
     -- do build
     local buildir = _get_buildir(opt)
-    local argv = opt.argv or {}
-    ninja.build(package, argv, {buildir = buildir, envs = opt.envs or buildenvs(package, opt)})
+    local targets = table.wrap(opt.target)
+    ninja.build(package, targets, {buildir = buildir, envs = opt.envs or buildenvs(package, opt)})
 end
 
 -- install package
@@ -137,5 +137,6 @@ function install(package, configs, opt)
 
     -- do build and install
     local buildir = _get_buildir(opt)
-    ninja.install(package, {}, {buildir = buildir, envs = opt.envs or buildenvs(package, opt)})
+    local targets = table.wrap(opt.target)
+    ninja.install(package, targets, {buildir = buildir, envs = opt.envs or buildenvs(package, opt)})
 end