Update value of __cplusplus to 201703L.

zygoloid · zygoloid · commit c9354b33e1de · 2017-03-15T18:29:49.000-07:00
Fixes #1513 and NB CA 15 and US 83 (C++17 CD).
diff --git a/source/config.tex b/source/config.tex
@@ -3,7 +3,7 @@
 %% Version numbers
 \newcommand{\docno}{Dxxxx}
 \newcommand{\prevdocno}{N4640}
-\newcommand{\cppver}{201402L}
+\newcommand{\cppver}{201703L}
 
 %% Release date
 \newcommand{\reldate}{\today}
