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>

 # Wrapper to build the companion tools facilities

 # List all companion tools facilities, and parse their scripts

 CT_COMP_TOOLS_FACILITY_LIST=

 for f in "${CT_LIB_DIR}/scripts/build/companion_tools/"*.sh; do

     _f="$(basename "${f}" .sh)"

     _f="${_f#???-}"

     __f="CT_COMP_TOOLS_${_f}"

     if [ "${!__f}" = "y" ]; then

         CT_DoLog DEBUG "Enabling companion tools '${_f}'"

         . "${f}"

         CT_COMP_TOOLS_FACILITY_LIST="${CT_COMP_TOOLS_FACILITY_LIST} ${_f}"

     else

         CT_DoLog DEBUG "Disabling companion tools '${_f}'"

     fi

 done

 # Download the companion tools facilities

 do_companion_tools_get() {

     for f in ${CT_COMP_TOOLS_FACILITY_LIST}; do

         do_companion_tools_${f}_get

     done

 }

 # Extract and patch the companion tools facilities

 do_companion_tools_extract() {

     for f in ${CT_COMP_TOOLS_FACILITY_LIST}; do

         do_companion_tools_${f}_extract

     done

 }

 # Build the companion tools facilities

 do_companion_tools() {

     for f in ${CT_COMP_TOOLS_FACILITY_LIST}; do

         do_companion_tools_${f}_build

     done

 }