GMP-5.0.1 with Mingw32: incorrect .def filename

[Laurent Rineau]

Hi,

In GMP-5.0.1, the SOMAJOR of libgmp is 10 and the SOMAJOR of libgmpxx is 6.

However, the configure.in around line 2211 says:

case $host in
  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2*)
    # By default, build only static.
    # 
    # [snip a big comment]
    #
    if test "$enable_shared" = yes; then
      GMP_LDFLAGS="$GMP_LDFLAGS -no-undefined -Wl,--export-all-symbols"
      LIBGMP_LDFLAGS="$LIBGMP_LDFLAGS -Wl,--output-def,.libs/libgmp-3.dll.def"
      LIBGMPXX_LDFLAGS="$LIBGMP_LDFLAGS -Wl,--output-def,.libs/libgmpxx-3.dll.def"

      LIBGMP_DLL=1
    fi
    ;;

You can see that, on a Mingw platform, the --output-def linker flag is incorrect: the version number in the file name is "3", where is should be either "10" for libgmp or "6" for libgmpxx.

I propose the attached patch: it puts those linker flags into a conditional part of Makefile.am. The condition is LIBGMP_DLL, which is turned into an Automake conditional in configure.in. That way, the setup of 
the flags can use the (Auto)Make variables $(LIBGMP_LT_CURRENT) and $(LIBGMPXX_LT_CURRENT).

I have verified that, with this patch, the library builds with --enable-shared on the platform core2-unknown-linux-gnu, and on the cross-platform x86_64-unknown-linux-gnu with host=i686-pc-mingw32. I hope such 
a patch can be integrated in GMP.
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