Fix test_demangle_stacks_symbol_map on Windows (os.linesep should be …

…used only on files opened in binary mode on Windows, but if a file is opened in text mode, it will have \n line endings in memory as usual

tests/test_core.py

@@ -6118,7 +6118,7 @@ def test_demangle_stacks_symbol_map(self):
     self.emcc_args += ['--emit-symbol-map']
     self.do_run(open(path_from_root('tests', 'core', 'test_demangle_stacks.c')).read(), 'abort')
     # make sure the shortened name is the right one
-    symbols = open('src.cpp.o.js.symbols').read().split(os.linesep)
+    symbols = open('src.cpp.o.js.symbols').read().split('\n')
     for line in symbols:
       if ':' not in line: continue
       short, full = line.split(':')