Bug 1501197 - Disable test_load_modules.js on win10 for frequent failures. r=jmaher

services/sync/tests/unit/xpcshell.ini

@@ -19,6 +19,7 @@ support-files =
 
 # Ensure we can import everything.
 [test_load_modules.js]
+skip-if = (os == 'win' && os_version == '10.0') # Bug 1501197
 
 # util contains a bunch of functionality used throughout.
 [test_utils_catch.js]