Pick up CPPFLAGS and LDFLAGS from environment variables

Author: Watson1978

ext/ilios/extconf.rb

@@ -159,4 +159,7 @@ def self.install_from_source
   CassandraDriverInstaller.install
 end
 
+$CPPFLAGS += " #{ENV['CPPFLAGS']}"
+$LDFLAGS += " #{ENV['LDFLAGS']}"
+
 create_makefile('ilios')