Tolerate weird cl_kernels modules on Mac OS X 10.11

Tolerate weird cl_kernels modules on Mac OS X 10.11.

The cl_kernels bug (Apple bug 20239912) in which cl_kernels modules show
up with an __LD,__compact_unwind section inside the __TEXT segment, is
still present in Mac OS X 10.11. This results in these warnings and a
failure to load the module:

[pid:tid:yyyymmdd,hhmmss.uuuuuu:WARNING
mach_o_image_segment_reader.cc:142] section.segname incorrect in
segment __TEXT, section __LD,__compact_unwind 3/6, load command 0x19
0/6, module cl_kernels, address 0x10e964000

BUG=crashpad:42
TEST=crashpad_snapshot_test ProcessReader.*Modules
R=rsesek@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/cd1f8fa3d2f2c76802952beac71ad85f51bbf771

[Mark Mentovai, 2015-08-05 18:06:42]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org

[Robert Sesek, 2015-08-05 20:20:03]

LGTM

[Mark Mentovai, 2015-08-05 21:13:15]

Committed patchset #1 (id:1) manually as
cd1f8fa3d2f2c76802952beac71ad85f51bbf771 (presubmit successful).