[NFC][libcxx] Remove trailing whitespace

It's incredibly annoying when trying to create diffs

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@361981 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/complex b/include/complex
index ff702b4..c168406 100644
--- a/include/complex
+++ b/include/complex
@@ -1449,10 +1449,10 @@
     return __os << __s.str();
 }
 
-#if _LIBCPP_STD_VER > 11 
+#if _LIBCPP_STD_VER > 11
 // Literal suffix for complex number literals [complex.literals]
 inline namespace literals
-{ 
+{
   inline namespace complex_literals
   {
     constexpr complex<long double> operator""il(long double __im)