Merge branch 'core-updates'

Conflicts:
	gnu/packages/bootstrap.scm

gnu: file: Update to 5.20.

* gnu/packages/file.scm (file): Update to 5.20.
  (file-5.20): Remove.
* gnu/packages/patches/file-CVE-2014-3587.patch: Remove.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.
* gnu/packages/patchutils.scm (quilt): Use FILE instead of FILE-5.20.
* gnu/packages/version-control.scm (aegis): Ditto.

gnu: aegis, quilt: Use file-5.20.

Suggested by Mark H Weaver.

* gnu/packages/version-control.scm (aegis): Use FILE-5.20 instead of FILE.
* gnu/packages/patchutils.scm (quilt): Likewise.

gnu: Add patchutils and quilt

* gnu/packages/patchutils.scm: New file
* gnu/packages/patches/patchutils-xfail-gendiff-tests.patch: New patch
* gnu-system.am (GNU_SYSTEM_MODULES): Add patchutils.
  (dist_patch_DATA): Add patch.