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>

 # This file adds the functions to build the MPC library

 # Copyright 2009 Yann E. MORIN

 # Licensed under the GPL v2. See COPYING in the root of this package

 do_mpc_get() { :; }

 do_mpc_extract() { :; }

 do_mpc() { :; }

 # Overide functions depending on configuration

 if [ "${CT_MPC}" = "y" ]; then

 # Download MPC

 do_mpc_get() {

     CT_GetFile "mpc-${CT_MPC_VERSION}" .tar.gz      \

         http://www.multiprecision.org/mpc/download

 }

 # Extract MPC

 do_mpc_extract() {

     CT_Extract "mpc-${CT_MPC_VERSION}"

     CT_Patch "mpc" "${CT_MPC_VERSION}"

 }

 do_mpc() {

     mkdir -p "${CT_BUILD_DIR}/build-mpc"

     cd "${CT_BUILD_DIR}/build-mpc"

     CT_DoStep INFO "Installing MPC"

     CT_DoLog EXTRA "Configuring MPC"

     CT_DoExecLog CFG                                \

     CFLAGS="${CT_CFLAGS_FOR_HOST}"                  \

     "${CT_SRC_DIR}/mpc-${CT_MPC_VERSION}/configure" \

         --build=${CT_BUILD}                         \

         --host=${CT_HOST}                           \

         --prefix="${CT_COMPLIBS_DIR}"               \

         --with-gmp="${CT_COMPLIBS_DIR}"             \

         --with-mpfr="${CT_COMPLIBS_DIR}"            \

         --disable-shared                            \

         --enable-static

     CT_DoLog EXTRA "Building MPC"

     CT_DoExecLog ALL make ${JOBSFLAGS}

     if [ "${CT_COMPLIBS_CHECK}" = "y" ]; then

         CT_DoLog EXTRA "Checking MPC"

         CT_DoExecLog ALL make ${JOBSFLAGS} -s check

     fi

     CT_DoLog EXTRA "Installing MPC"

     CT_DoExecLog ALL make install

     CT_EndStep

 }

 fi # CT_MPC