configure: Add C compiler flag to indicate C89

author: Kim Alvefur <zash@zash.se>
date: Fri, 19 Aug 2016 16:00:12 +0200
parent: 7613:1169097e0ef8
child: 7615:940603e99032
--- a/configure	Fri Aug 19 15:59:12 2016 +0200
+++ b/configure	Fri Aug 19 16:00:12 2016 +0200
@@ -21,7 +21,7 @@
 PRNG=
 PRNGLIBS=
 
-CFLAGS="-fPIC -Wall -pedantic"
+CFLAGS="-fPIC -Wall -pedantic -std=c89"
 LDFLAGS="-shared"
 
 IDN_LIBRARY="idn"