bug#26136: core-updates: python-minimal@2.7.13 fails due to missing zlib

[Leo Famulari <leo@famulari.name>]

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python-minimal@2.7.13 is failing to build on core-updates:

https://hydra.gnu.org/build/1912761

I saw this near the beginning of the install phase:

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configure: error: cannot run /bin/sh
/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13/Modules/_ctypes/libffi/config.sub
Failed to configure _ctypes module

Python build finished, but the necessary bits to build these modules
were not found:
_bsddb             _curses            _curses_panel   
_sqlite3           _ssl               _tkinter        
bsddb185           dbm                dl              
gdbm               imageop            readline        
sunaudiodev        zlib                               
To find the necessary bits, look in setup.py in detect_modules() for the
module's name.
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And at the end, it fails:

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if test "xinstall" != "xno"  ; then \
	case install in \
		upgrade) ensurepip="--upgrade" ;; \
		install|*) ensurepip="" ;; \
	esac; \
	LD_LIBRARY_PATH=/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13 ./python -E -m ensurepip \
		$ensurepip --root=/ ; \
fi
Traceback (most recent call last):
  File "/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13/Lib/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13/Lib/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13/Lib/ensurepip/__main__.py", line 4, in <module>
    ensurepip._main()
  File "/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13/Lib/ensurepip/__init__.py", line 205, in _main
    default_pip=args.default_pip,
  File "/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13/Lib/ensurepip/__init__.py", line 108, in bootstrap
    _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
  File "/tmp/guix-build-python-minimal-2.7.13.drv-0/Python-2.7.13/Lib/ensurepip/__init__.py", line 31, in _run_pip
    import pip
zipimport.ZipImportError: can't decompress data; zlib not available
make: *** [Makefile:927: install] Error 1
phase `install' failed after 29.1 seconds
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