[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:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Other
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
  driver/recomp011                   |
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 Some linux systems may use target-prefixed names for `binutils`. For
 example on my Exherbo Linux readelf is named as `x86_64-pc-linux-gnu-
 readelf`. This leads to errors like:

 > readelf: createProcess: runInteractiveProcess: exec: does not exist (No
 such file or directory)

 To fix this GHC needs to give ability to configure name of this tool (like
 `SysTools.runSplit` and `SysTools.runCc`) or use `libelf`-like library.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10974>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler