[GHC] #11684: Fix tests with Clang

[GHC]

#11684: Fix tests with Clang
-------------------------------------+-------------------------------------
        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by erikd):

 From IRC:

 {{{
 <thomie> erikd: FPTOOLS_SET_C_LD_FLAGS also sets CONF_CC_OPTS_STAGE0 it
 seems
 <thomie> FPTOOLS_SET_C_LD_FLAGS([build],[CONF_CC_OPTS_STAGE0],
          [CONF_GCC_LINKER_OPTS_STAGE0],[CONF_LD_LINKER_OPTS_STAGE0],
          [CONF_CPP_OPTS_STAGE0])
 <thomie> in configure.ac
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11684#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler