integer-gmp2 tries to be GMP 4.x compatible but uses functions from GMP 5.x

Hello, recent HEAD is using integer-gmp2 wrapper around GMP library. This tries to be compatible with and use only functionality of GMP 4.x, but still it also uses some functions from GMP 5.x which makes this incompatible with GMP 4.x. The issue is for example shown on Solaris/SPARC platform where the OS provided library is GMP 4.3.2 and linking of stage2 binaries fails with:

Undefined                       first referenced
 symbol                             in file
__gmpn_andn_n /home/karel/src/ghc-sparc-reg_ncg-head-2015-01-17/libraries/integer-gmp2/dist-install/build/libHSinteg_21cuTlnn00eFNd4GMrxOMi.a(Type.o)
__gmpn_and_n /home/karel/src/ghc-sparc-reg_ncg-head-2015-01-17/libraries/integer-gmp2/dist-install/build/libHSinteg_21cuTlnn00eFNd4GMrxOMi.a(Type.o)
__gmpn_ior_n /home/karel/src/ghc-sparc-reg_ncg-head-2015-01-17/libraries/integer-gmp2/dist-install/build/libHSinteg_21cuTlnn00eFNd4GMrxOMi.a(Type.o)
__gmpn_xor_n /home/karel/src/ghc-sparc-reg_ncg-head-2015-01-17/libraries/integer-gmp2/dist-install/build/libHSinteg_21cuTlnn00eFNd4GMrxOMi.a(Type.o)
ld: fatal: symbol referencing errors. No output written to ghc/stage2/build/tmp/ghc-stage2

the unresolve symbols are from GMP 5.x. GMP 4.x does not provide them.

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
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