Adding custominstallerbuilder config_build.txt.

This build file is needed to set up the RepyV2 runtime which the
custominstallerbuilder requires to run. We need to do that because
plain Python `import`'s from Repy libraries don't currently work.

Future contributors, please check if this workaround is still needed
every time progress is made on SeattleTestbed/portability#25,
SeattleTestbed/portability#26, SeattleTestbed/portability#27, or
SeattleTestbed/portability#28!

scripts/config_build.txt

@@ -0,0 +1,18 @@
+# Build file for the Repy runtime that the custominstallerbuilder requires. 
+# (Essentially identical with repy_v2's config_build.txt).
+#
+# If it were not for the problems with repyportability / repyhelper / 
+# dylink, the custominstallerbuilder code could do plain Python `import`'s 
+# from Repy files, and be done. Since that doesn't work currently, 
+# we build a directory containing the full runtime instead.
+#
+# Contributors please note:
+# Be sure to revisit this workaround whenever progress is made on 
+# SeattleTestbed/portability#25 through 28!
+repy_v2/*
+portability/*
+seattlelib_v2/*
+seash/*
+clearinghouse/xmlrpc_clients/seattleclearinghouse_xmlrpc.py
+dist/LICENSE.TXT
+