This commit enables the bz2, dbm, readline, ssl and zlib modules.
* gnu/packages/gdbm.scm: Enable the compatibility mode.
* gnu/packages/python.scm: Enable a few modules from the standard library.
* gnu/packages/patches/python-fix-dbm.patch: New file.
* Makefile.am: Add it.
* gnu/packages/autotools.scm (automake)[native-search-paths]: New field.
* gnu/packages/guile.scm (guile-1.8)[native-search-paths]: New field.
(guile-2.0)[native-search-paths]: New field.
* gnu/packages/python.scm (python)[native-search-paths]: New field.