[GHC] #10974: Fix SysTools.readElfSection on platforms where "readelf" have different name

[GHC]

#10974: Fix SysTools.readElfSection on platforms where "readelf" have different
name
-------------------------------------+-------------------------------------
        Reporter:  ony               |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
                                     |  driver/recomp011
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1326
       Wiki Page:                    |  Phab:D1335
-------------------------------------+-------------------------------------

Comment (by hsyl20):

 I have recently written my own ELF parser
 (https://github.com/hsyl20/ViperVM/tree/master/src/lib/ViperVM/Format/Elf)
 so it is still fresh in my head. I have adapted it to GHC by removing
 intermediate data structures and everything that is not strictly required
 to extract a section.

 https://phabricator.haskell.org/D1381

 I'm not an expert of lazy IO, so reviews are welcome.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10974#comment:10>
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