[yasm] Disable -Wmisleading-indentation

This will unblock the ffmpeg roll.

Change-Id: I4c0b413dbf3b6fedd3cd70b4d79478025bd243af
diff --git a/BUILD.gn b/BUILD.gn
index 729659b..db5d0f9 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -106,6 +106,10 @@
         # re2c contains many static functions in headers (because it's
         # a C library predating C99.)
         "-Wno-unused-function",
+
+        # re2 may have questionable indentation. We should come back later
+        # to confirm if this indentation is expected.
+        "-Wno-misleading-indentation",
       ]
     }
   }