complibs/cloog: fix linking with libm

In Ubuntu 11.04 and 11.10, the default options for ld have changed.
--no-copy-dt-needed-entries and --as-needed are now enabled by default, which
causes errors like:

[EXTRA] Checking CLooG/ppl
[DEBUG] ==> Executing: 'make' '-j3' '-s' 'check'
[ALL ] Making check in .
[ALL ] config.status: creating include/cloog/cloog-config.h
[ALL ] config.status: include/cloog/cloog-config.h is unchanged
[ALL ] libtool: link: i686-build_pc-linux-gnu-gcc -Wall -fomit-frame-pointer
-pipe -o cloog cloog.o -L/<snip>/build/static/lib ./.libs/libcloog.a -lm
/<snip>/build/static/lib/libppl_c.a /<snip>/build/static/lib/libpwl.a
/<snip>/build/static/lib/libppl.a /<snip>/build/static/lib/libgmpxx.a
/<snip>/build/static/lib/libgmp.a -lstdc++
[ALL ] /usr/bin/ld: /<snip>/build/static/lib/libppl.a(MIP_Problem.o):
undefined reference to symbol 'sqrt@@GLIBC_2.0'
[ALL ] /usr/bin/ld: note: 'sqrt@@GLIBC_2.0' is defined in DSO
/usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so so try adding
it to the linker command line
[ALL ] /usr/lib/gcc/i686-linux-gnu/4.6.1/../../../i386-linux-gnu/libm.so:
could not read symbols: Invalid operation
[ALL ] collect2: ld returned 1 exit status
[ERROR] make[2]: *** [cloog] Error 1
[ERROR] make[1]: *** [check-recursive] Error 1

See:
https://wiki.ubuntu.com/NattyNarwhal/ToolchainTransition

This patch fixes these errors by placing '-lm' at the right place on the command
line as libppl requires libm when linking cloog.

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>

 diff -durN gcc-4.4.4.orig/gcc/config/sparc/freebsd.h gcc-4.4.4/gcc/config/sparc/freebsd.h

 --- gcc-4.4.4.orig/gcc/config/sparc/freebsd.h	2007-08-02 12:49:31.000000000 +0200

 +++ gcc-4.4.4/gcc/config/sparc/freebsd.h	2010-05-16 19:12:00.000000000 +0200

 @@ -25,9 +25,22 @@

  /* FreeBSD needs the platform name (sparc64) defined.

     Emacs needs to know if the arch is 64 or 32-bits.  */

 -#undef  CPP_CPU64_DEFAULT_SPEC

 -#define CPP_CPU64_DEFAULT_SPEC \

 -  "-D__sparc64__ -D__sparc_v9__ -D__sparcv9 -D__arch64__"

 +#undef  FBSD_TARGET_CPU_CPP_BUILTINS

 +#define FBSD_TARGET_CPU_CPP_BUILTINS()                  \

 +  do                                                    \

 +    {                                                   \

 +      if (TARGET_ARCH64)                                \

 +        {                                               \

 +          builtin_define ("__sparc64__");               \

 +          builtin_define ("__sparc_v9__");              \

 +          builtin_define ("__sparcv9");                 \

 +        }                                               \

 +      else                                              \

 +        builtin_define ("__sparc");                     \

 +      builtin_define ("__sparc__");                     \

 +    }                                                   \

 +  while (0)

 +

  #define LINK_SPEC "%(link_arch)						\

    %{!mno-relax:%{!r:-relax}}						\