use os.system for file copies on posix systems

sickbeard/helpers.py

@@ -342,7 +342,11 @@ def listMediaFiles(path):
 
 
 def copyFile(srcFile, destFile):
-    ek.ek(shutil.copyfile, srcFile, destFile)
+    if isPosix():
+        os.system('cp "%s" "%s"' % (srcFile, destFile))
+    else:
+        ek.ek(shutil.copyfile, srcFile, destFile)
+        
     try:
         ek.ek(shutil.copymode, srcFile, destFile)
     except OSError:
@@ -366,6 +370,12 @@ def link(src, dst):
     else:
         os.link(src, dst)
 
+def isPosix(): 
+    if os.name.startswith('posix'):
+        return True
+    else:
+        return False
+
 
 def hardlinkFile(srcFile, destFile):
     try: