gnu: Add ceph.

* gnu/packages/storage.scm,
  gnu/packages/patches/ceph-disable-cpu-optimizations.patch,
  gnu/packages/patches/ceph-skip-collect-sys-info-test.patch,
  gnu/packages/patches/ceph-skip-unittest_blockdev.patch: New files.
* gnu/local.mk (GNU_SYSTEM_MODULES, dist_patch_DATA): Register it.

gnu/packages/patches/ceph-skip-unittest_blockdev.patch

@@ -0,0 +1,28 @@
+This test tries to walk a sysfs path and hits a null pointer exception.
+
+/tmp/guix-build-ceph-12.0.0.drv-0/ceph-12.0.0/src/test/common/test_blkdev.cc:32: Failure
+Expected: (dir) != (nullptr), actual: NULL vs 8-byte object <00-00 00-00 00-00 00-00>
+
+diff --git a/src/test/common/CMakeLists.txt b/src/test/common/CMakeLists.txt
+index 5172663898..ac84085eaa 100644
+--- a/src/test/common/CMakeLists.txt
++++ b/src/test/common/CMakeLists.txt
+@@ -12,15 +12,6 @@ target_link_libraries(get_command_descriptions
+   ${CMAKE_DL_LIBS}
+   )
+ 
+-if(HAVE_BLKID)
+-# unittest_blkdev
+-add_executable(unittest_blkdev
+-  test_blkdev.cc
+-  )
+-add_ceph_unittest(unittest_blkdev ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/unittest_blkdev)
+-target_link_libraries(unittest_blkdev global ${BLKID_LIBRARIES})
+-endif(HAVE_BLKID)
+-
+ # unittest_bloom_filter
+ add_executable(unittest_bloom_filter
+   test_bloom_filter.cc
+-- 
+2.11.1
+