* gnu/packages/patches/valgrind-glibc-2.21.patch: Rename to ...
gnu/packages/patches/valgrind-glibc-2.22.patch: ... this, and add a case for
glibc-2.22.
* gnu/packages/patches/valgrind-linux-libre-4.x.patch: New file.
* gnu-system.am (dist_patch_DATA): Add the new file, and rename the other one.
* gnu/packages/valgrind.scm (valgrind)[source]: Add new patch.