(see #505) Fix Module::Build on newer versions of perl

This commit manually changes the sources in a dependency rather
than updating the dependency. This isn't ideal, but I'm not sure
what impact updating Module::Build could have on the rest of the
dependencies/older systems running nagios-plugins, whereas this
change seemed relatively safe.

NEWS

@@ -1,5 +1,9 @@
 This file documents the major additions and syntax changes between releases.
 
+2.3.2 ????-??-??
+	FIXES
+	perl dependencies: updated the included Module::Build to work with newer versions of perl (#505)
+
 2.3.1 2019-12-09
 	FIXES
 	check_icmp: Fixed backward-compatibility issue with performance data (#480)