[libc++] [docs] Exclude helper files from Sphinx configuration to avoid generating empty pages.

libcxx/docs/Cxx1yStatus.rst

@@ -4,7 +4,7 @@
 libc++ C++14 Status
 ================================
 
-.. include:: Styles.rst
+.. include:: Helpers/Styles.rst
 
 .. contents::
    :local:

libcxx/docs/Cxx1zStatus.rst

@@ -4,7 +4,7 @@
 libc++ C++17 Status
 ================================
 
-.. include:: Styles.rst
+.. include:: Helpers/Styles.rst
 
 .. contents::
    :local:

libcxx/docs/Cxx2aStatus.rst

@@ -4,7 +4,7 @@
 libc++ C++2a Status
 ================================
 
-.. include:: Styles.rst
+.. include:: Helpers/Styles.rst
 
 .. contents::
    :local:

libcxx/docs/conf.py

@@ -63,7 +63,7 @@ today_fmt = '%Y-%m-%d'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-exclude_patterns = ['_build']
+exclude_patterns = ['_build', 'Helpers']
 
 # The reST default role (used for this markup: `text`) to use for all documents.
 #default_role = None