configure: Separate flags related to compiler warnings
This should make it more obvious that these are related
--- a/configure Thu Mar 14 16:18:00 2019 +0000
+++ b/configure Sat Mar 16 18:43:11 2019 +0100
@@ -23,7 +23,8 @@
PRNG=
PRNGLIBS=
-CFLAGS="-fPIC -Wall -pedantic -std=c99"
+CFLAGS="-fPIC -std=c99"
+CFLAGS="$CFLAGS -Wall -pedantic"
LDFLAGS="-shared"
IDN_LIBRARY="idn"