Only include .js files from src/languages

Ie. don't include vim *.swp files

Author: stain

tools/build.py

@@ -119,7 +119,7 @@ def language_filenames(src_path, languages):
     Resolves dependencies and returns the list of actual language filenames
     '''
     lang_path = os.path.join(src_path, 'languages')
-    filenames = [os.path.join(lang_path, f) for f in os.listdir(lang_path)]
+    filenames = [os.path.join(lang_path, f) for f in os.listdir(lang_path) if f.endswith('.js')]
     headers = [parse_header(f) for f in filenames]
     infos = [(h, f) for h, f in zip(headers, filenames) if h]