Fix warnings from latest flake8. NFC (emscripten-core#20574)

I'm having trouble upgrading to the latest version of flake8 but
we can at least fix the warnings it reports.

emrun.py

@@ -770,7 +770,7 @@ def get_cpu_info():
       all_info = check_output(['cat', '/proc/cpuinfo']).strip()
       for line in all_info.split("\n"):
         if 'model name' in line:
-          cpu_name = re.sub('.*model name.*:', '', line, 1).strip()
+          cpu_name = re.sub('.*model name.*:', '', line, count=1).strip()
       lscpu = check_output(['lscpu'])
       frequency = int(float(re.search('CPU MHz: (.*)', lscpu).group(1).strip()) + 0.5)
       sockets = int(re.search(r'Socket\(s\): (.*)', lscpu).group(1).strip())
@@ -1298,7 +1298,7 @@ def list_pc_browsers():
   logi('')
   for browser in browsers:
     browser_exe = find_browser(browser)
-    if type(browser_exe) == list:
+    if type(browser_exe) is list:
       browser_exe = browser_exe[0]
     if browser_exe:
       logi('  - ' + browser + ': ' + browser_display_name(browser_exe) + ' ' + get_executable_version(browser_exe))

test/common.py

@@ -875,7 +875,7 @@ def get_setting(self, key, default=None):
   def set_setting(self, key, value=1):
     if value is None:
       self.clear_setting(key)
-    if type(value) == bool:
+    if type(value) is bool:
       value = int(value)
     self.settings_mods[key] = value
 
@@ -890,7 +890,7 @@ def serialize_settings(self):
     for key, value in self.settings_mods.items():
       if value == 1:
         ret.append(f'-s{key}')
-      elif type(value) == list:
+      elif type(value) is list:
         ret.append(f'-s{key}={",".join(value)}')
       else:
         ret.append(f'-s{key}={value}')
@@ -1221,7 +1221,7 @@ def assertContained(self, values, string, additional_info='', regex=False):
       string = string()
 
     if regex:
-      if type(values) == str:
+      if type(values) is str:
         self.assertTrue(re.search(values, string), 'Expected regex "%s" to match on:\n%s' % (values, string))
       else:
         match_any = any(re.search(o, string) for o in values)

test/jsrun.py

@@ -90,7 +90,7 @@ def run_js(filename, engine, args=None,
   """Execute javascript code generated by tests, with possible timeout."""
 
   # We used to support True here but we no longer do.  Assert here just in case.
-  assert type(assert_returncode) == int
+  assert type(assert_returncode) is int
 
   if not os.path.exists(filename):
     raise Exception('output file not found: ' + filename)

tools/settings.py

@@ -239,7 +239,7 @@ def check_type(self, name, value):
         value = bool(value)
       if value in ('True', 'False', 'true', 'false'):
         exit_with_error('attempt to set `%s` to `%s`; use 1/0 to set boolean settings' % (name, value))
-    if type(value) != expected_type:
+    if type(value) is not expected_type:
       exit_with_error('setting `%s` expects `%s` but got `%s`' % (name, expected_type.__name__, type(value).__name__))
 
   def __getitem__(self, key):

tools/webidl_binder.py

@@ -655,7 +655,7 @@ def add_bounds_check_impl():
   js_impl_methods: List[str] = []
 
   cons = interface.getExtendedAttribute('Constructor')
-  if type(cons) == list:
+  if type(cons) is list:
     raise Exception('do not use "Constructor", instead create methods with the name of the interface')
 
   js_impl = interface.getExtendedAttribute('JSImplementation')