Correctly pass arguments to kiwix-tools meson script.

Now that meson.build script add itself the needed link flags to link
static binaries, we don't need to add them by ourself.

Just pass the right option to meson.

kiwix-build.py

@@ -569,6 +569,7 @@ class CMakeBuilder(MakeBuilder):
            env.update(self.configure_env)
         self.buildEnv.run_command(command, self.build_path, context, env=env, allow_wrapper=False)
 
+
 class MesonBuilder(Builder):
     configure_option = ""
     def _gen_env(self):
@@ -578,8 +579,6 @@ class MesonBuilder(Builder):
                                   else pj(self.buildEnv.install_dir, self.buildEnv.libprefix, 'pkgconfig')
                                  )
         env['PATH'] = ':'.join([pj(self.buildEnv.install_dir, 'bin'), env['PATH']])
-        if self.buildEnv.build_static:
-            env['LDFLAGS'] = env['LDFLAGS'] + " -static-libstdc++ --static"
         return env
 
     def _configure(self, context):
@@ -808,7 +807,12 @@ class KiwixTools(Dependency):
         git_dir = "kiwix-tools"
 
     class Builder(MesonBuilder):
-        configure_option = "-Dctpp2-install-prefix={buildEnv.install_dir}"
+        @property
+        def configure_option(self):
+           base_options = "-Dctpp2-install-prefix={buildEnv.install_dir}"
+           if self.buildEnv.build_static:
+               base_options += " -Dstatic-linkage=true"
+           return base_options
 
 
 class Builder: