Do not build server test on windows.

On the appveyor CI, the link of the `server` test fails with
`libmicrohttpd`.

Do not build the test on windows to not break the CI.

test/meson.build

@@ -12,9 +12,13 @@ tests = [
     'kiwixserve',
     'book',
     'manager',
-    'server'
 ]
 
+if build_machine.system() != 'windows'
+  tests += ['server']
+endif
+
+
 
 gtest_dep = dependency('gtest',
                        main:true,