Problem: builds directory contains packaging scripts

Specifically, the RedHat tools.

Solution: move this into packaging/

Makefile.am

@@ -731,7 +731,7 @@ dist-hook:
 	else \
 		echo A git clone is required to generate a ChangeLog >&2; \
 	fi
-	-cp $(top_srcdir)/builds/redhat/zeromq.spec $(distdir)/zeromq.spec
+	-cp $(top_srcdir)/packaging/redhat/zeromq.spec $(distdir)/zeromq.spec
 
 maintainer-clean-local:
 	-rm -rf $(top_srcdir)/config

builds/README

@@ -0,0 +1,4 @@
+This directory holds build tools, i.e. tools we use to build the current
+code tree. Packaging tools (which take released tarballs or github code
+repos) should go into /packaging.
+

configure.ac

@@ -606,6 +606,6 @@ AC_CONFIG_FILES([ \
     doc/Makefile \
     builds/Makefile \
     builds/msvc/Makefile \
-    builds/redhat/zeromq.spec])
+    packaging/redhat/zeromq.spec])
 
 AC_OUTPUT

packaging/README

@@ -0,0 +1,4 @@
+This directory is for packaging tools. Please do not hardcode version
+numbers into your scripts; you can get them at runtime by calling
+version.sh, or at configure time if you use autoconf.
+