Remove unneeded -Wno-dangling-field flag

Test: m checkbuild
Change-Id: I4867fb80ffa901d4fef96b315cd114e6f9b82476
diff --git a/cc/config/clang.go b/cc/config/clang.go
index ae13fa2..6996680 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -189,9 +189,6 @@
 
 		// Disable this warning because we don't care about behavior with older compilers.
 		"-Wno-return-std-move-in-c++11",
-
-		// Disable this warning until we can fix all instances where it fails.
-		"-Wno-dangling-field",
 	}, " "))
 
 	// Extra cflags for projects under external/ directory