build: fix up style issues in configure script

* Use single quotes consistently.
* Remove a few stray semicolons.
* Fix up some overly long lines.
* Line up a few expressions.

Author: bnoordhuis

configure

@@ -406,13 +406,15 @@ def host_arch_win():
 
 def compiler_version():
   try:
-    proc = subprocess.Popen(shlex.split(CC) + ['--version'], stdout=subprocess.PIPE)
+    proc = subprocess.Popen(shlex.split(CC) + ['--version'],
+                            stdout=subprocess.PIPE)
   except WindowsError:
     return (0, False)
 
   is_clang = 'clang' in proc.communicate()[0].split('\n')[0]
 
-  proc = subprocess.Popen(shlex.split(CC) + ['-dumpversion'], stdout=subprocess.PIPE)
+  proc = subprocess.Popen(shlex.split(CC) + ['-dumpversion'],
+                          stdout=subprocess.PIPE)
   version = tuple(map(int, proc.communicate()[0].split('.')))
 
   return (version, is_clang)
@@ -432,7 +434,7 @@ def configure_arm(o):
 
 def configure_node(o):
   if options.dest_os == 'android':
-    o['variables']['OS'] = "android"
+    o['variables']['OS'] = 'android'
   o['variables']['v8_enable_gdbjit'] = 1 if options.gdb else 0
   o['variables']['v8_no_strict_aliasing'] = 1 # work around compiler bugs
   o['variables']['node_prefix'] = os.path.expanduser(options.prefix or '')
@@ -488,15 +490,15 @@ def configure_node(o):
 
   # By default, enable ETW on Windows.
   if flavor == 'win':
-    o['variables']['node_use_etw'] = b(not options.without_etw);
+    o['variables']['node_use_etw'] = b(not options.without_etw)
   elif options.with_etw:
     raise Exception('ETW is only supported on Windows.')
   else:
     o['variables']['node_use_etw'] = 'false'
 
   # By default, enable Performance counters on Windows.
   if flavor == 'win':
-    o['variables']['node_use_perfctr'] = b(not options.without_perfctr);
+    o['variables']['node_use_perfctr'] = b(not options.without_perfctr)
   elif options.with_perfctr:
     raise Exception('Performance counter is only supported on Windows.')
   else:
@@ -611,22 +613,24 @@ def configure_winsdk(o):
   if flavor != 'win':
     return
 
-  winsdk_dir = os.environ.get("WindowsSdkDir")
+  winsdk_dir = os.environ.get('WindowsSdkDir')
 
   if winsdk_dir and os.path.isfile(winsdk_dir + '\\bin\\ctrpp.exe'):
-    print "Found ctrpp in WinSDK--will build generated files into tools/msvs/genfiles."
+    print('Found ctrpp in WinSDK--will build generated files '
+          'into tools/msvs/genfiles.')
     o['variables']['node_has_winsdk'] = 'true'
     return
 
-  print "ctrpp not found in WinSDK path--using pre-gen files from tools/msvs/genfiles."
+  print('ctrpp not found in WinSDK path--using pre-gen files '
+        'from tools/msvs/genfiles.')
 
 
 # determine the "flavor" (operating system) we're building for,
 # leveraging gyp's GetFlavor function
-flavor_params = {};
+flavor_params = {}
 if (options.dest_os):
-  flavor_params['flavor'] = options.dest_os;
-flavor = GetFlavor(flavor_params);
+  flavor_params['flavor'] = options.dest_os
+flavor = GetFlavor(flavor_params)
 
 output = {
   'variables': { 'python': sys.executable },
@@ -658,12 +662,12 @@ pprint.pprint(output, indent=2)
 
 def write(filename, data):
   filename = os.path.join(root_dir, filename)
-  print "creating ", filename
+  print 'creating ', filename
   f = open(filename, 'w+')
   f.write(data)
 
-write('config.gypi', "# Do not edit. Generated by the configure script.\n" +
-  pprint.pformat(output, indent=2) + "\n")
+write('config.gypi', '# Do not edit. Generated by the configure script.\n' +
+      pprint.pformat(output, indent=2) + '\n')
 
 config = {
   'BUILDTYPE': 'Debug' if options.debug else 'Release',