intl dep: support static kwarg

Since intl links internally to iconv, try to pull in iconv too, but only
if we specifically ask for static libs.

If PREFER_SHARED, we have no way to tell which type we got, so do not
try handling that...

mesonbuild/dependencies/misc.py

@@ -455,11 +455,14 @@ class IntlSystemDependency(SystemDependency):
         super().__init__(name, env, kwargs)
 
         h = self.clib_compiler.has_header('libintl.h', '', env)
-        self.link_args =  self.clib_compiler.find_library('intl', env, [])
+        self.link_args =  self.clib_compiler.find_library('intl', env, [], self.libtype)
 
         if h[0] and self.link_args:
             self.is_found = True
 
+            if self.static:
+                self.link_args += self.clib_compiler.find_library('iconv', env, [], self.libtype)
+
 
 @factory_methods({DependencyMethods.PKGCONFIG, DependencyMethods.CONFIG_TOOL, DependencyMethods.SYSTEM})
 def curses_factory(env: 'Environment',