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>

 From: http://sourceware.org/ml/crossgcc/2008-10/msg00044.html

 From: http://sources.redhat.com/ml/libc-ports/2007-06/msg00005.html

 2007-06-07  Steven Munroe  <sjmunroe@us.ibm.com>

     * sysdeps/powerpc/nofpu/Makefile: Remove fe_nomask from libm-support.

 diff -urN glibc-2.6.orig/glibc-ports-2.6.1/sysdeps/powerpc/nofpu/Makefile glibc-2.6/glibc-ports-2.6.1/sysdeps/powerpc/nofpu/Makefile

 --- glibc-2.6.orig/glibc-ports-2.6.1/sysdeps/powerpc/nofpu/Makefile	2006-11-22 09:13:11.000000000 -0600

 +++ glibc-2.6/glibc-ports-2.6.1/sysdeps/powerpc/nofpu/Makefile	2007-06-07 09:53:05.708240976 -0500

 @@ -6,7 +6,7 @@

  endif

  ifeq ($(subdir),math)

 -libm-support += fenv_const fe_nomask

 +libm-support += fenv_const

  CPPFLAGS += -I../soft-fp/

  # The follow CFLAGS are a work around for GCC Bugzilla Bug 29253

  # "expand_abs wrong default code for floating point"