Allow the compiler name to contain periods.
https://sourceforge.net/p/net-snmp/patches/1375/
--- configure.orig	2018-07-16 09:33:50.000000000 -0500
+++ configure	2018-09-12 23:15:49.000000000 -0500
@@ -25703,7 +25675,7 @@
         { $as_echo "$as_me:${as_lineno-$LINENO}: checking for Perl cc" >&5
 $as_echo_n "checking for Perl cc... " >&6; }
 
-        PERLCC=`$myperl -V:cc | $myperl -n -e 'print if (s/^\s*cc=.([-=\w\s\/]+).;\s*/$1/);'`
+        PERLCC=`$myperl -V:cc | $myperl -n -e 'print if (s/^\s*cc=.([-=\w\s\/.]+).;\s*/$1/);'`
 
         if test "x$PERLCC" != "x" ; then
             { $as_echo "$as_me:${as_lineno-$LINENO}: result: $PERLCC" >&5