[gn] Give two scripts argparse.RawDescriptionHelpFormatter

Without this, the doc string is put in a single line. These
scripts have multi-line docstrings, so this makes their --help
output look much nicer.

Otherwise, no behavior change.

Author: nico

llvm/utils/gn/build/symbol_exports.py

@@ -15,7 +15,9 @@
 
 
 def main():
-    parser = argparse.ArgumentParser(description=__doc__)
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
     parser.add_argument("--format", required=True, choices=("linux", "mac", "win"))
     parser.add_argument("source")
     parser.add_argument("output")

llvm/utils/gn/build/symlink_or_copy.py

@@ -12,7 +12,9 @@
 
 
 def main():
-    parser = argparse.ArgumentParser(description=__doc__)
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
     parser.add_argument(
         "--stamp", required=True, help="name of a file whose mtime is updated on run"
     )