wic: eliminate module checks

We're removing all external dependencies including rpm and urlgrabber,
so we don't need this check.

(From OE-Core rev: 429c0d72b9b8bfed34832e283be92996e074b9ac)

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/wic

@@ -38,16 +38,6 @@ import optparse
 import logging
 
 # External modules
-try:
-    import rpm
-    import urlgrabber
-except ImportError:
-    print("ERROR: failed to import necessary modules.")
-    print("Please ensure the following modules are installed:")
-    print("\trpm");
-    print("\turlgrabber");
-    sys.exit(1)
-
 scripts_path = os.path.abspath(os.path.dirname(os.path.abspath(sys.argv[0])))
 lib_path = scripts_path + '/lib'
 sys.path = sys.path + [lib_path]