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>

 --- dmalloc-5.5.2.orig/configure	2008-06-17 13:10:09.000000000 +0200

 +++ dmalloc-5.5.2/configure	2008-06-17 13:11:25.000000000 +0200

 @@ -4691,8 +4691,35 @@

  echo "$as_me:$LINENO: checking strdup macro" >&5

  echo $ECHO_N "checking strdup macro... $ECHO_C" >&6

  if test "$cross_compiling" = yes; then

 -  ac_cv_strdup_macro=no

 +  cat >conftest.$ac_ext <<_ACEOF

 +/* confdefs.h */

 +_ACEOF

 +cat confdefs.h >>conftest.$ac_ext

 +cat >>conftest.$ac_ext <<_ACEOF

 +/* end confdefs.h.  */

 +

 +#if HAVE_STDLIB_H

 +#  include <string.h>

 +#endif

 +

 +#ifndef strdup

 +       choke me

 +#endif

 +main() { exit(0); }

 +

 +_ACEOF

 +rm -f conftest.o conftest.obj

 +if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5

 +  (eval $ac_compile) 2>&5

 +  ac_status=$?

 +  echo "$as_me:$LINENO: \$? = $ac_status" >&5

 +  (exit $ac_status); }; then

 +  ac_cv_strdup_macro=yes

 +else

 +  ac_cv_strdup_macro=no

 +fi

 +  

  else

    cat >conftest.$ac_ext <<_ACEOF

  /* confdefs.h.  */