[libc++] Don't generate the modulemap file

We actually didn't generate anything in that file, so generating it
via CMake is useless.

Author: ldionne

libcxx/docs/Contributing.rst

@@ -156,7 +156,7 @@ sure you don't forget anything:
 - Did you add all new named declarations to the ``std`` module?
 - If you added a header:
 
-  - Did you add it to ``include/module.modulemap.in``?
+  - Did you add it to ``include/module.modulemap``?
   - Did you add it to ``include/CMakeLists.txt``?
   - If it's a public header, did you update ``utils/libcxx/header_information.py``?
 

libcxx/include/CMakeLists.txt

@@ -1023,7 +1023,6 @@ foreach(feature LIBCXX_ENABLE_FILESYSTEM LIBCXX_ENABLE_LOCALIZATION LIBCXX_ENABL
 endforeach()
 
 configure_file("__config_site.in" "${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}/__config_site" @ONLY)
-configure_file("module.modulemap.in" "${LIBCXX_GENERATED_INCLUDE_DIR}/module.modulemap" @ONLY)
 configure_file("${LIBCXX_ASSERTION_HANDLER_FILE}" "${LIBCXX_GENERATED_INCLUDE_DIR}/__assertion_handler" COPYONLY)
 
 set(_all_includes "${LIBCXX_GENERATED_INCLUDE_TARGET_DIR}/__config_site"

libcxx/include/module.modulemap.in renamed to libcxx/include/module.modulemap

@@ -155,7 +155,6 @@
 def is_header(file):
     """Returns whether the given file is a header (i.e. not a directory or the modulemap file)."""
     return not file.is_dir() and not file.name in [
-        "module.modulemap.in",
         "module.modulemap",
         "CMakeLists.txt",
         "libcxx.imp",