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>

 # Build script for autoconf

 CT_AUTOCONF_VERSION=2.65

 do_companion_tools_autoconf_get() {

     CT_GetFile "autoconf-${CT_AUTOCONF_VERSION}" \

                {ftp,http}://ftp.gnu.org/gnu/autoconf

 }

 do_companion_tools_autoconf_extract() {

     CT_Extract "autoconf-${CT_AUTOCONF_VERSION}"

     CT_DoExecLog ALL chmod -R u+w "${CT_SRC_DIR}/autoconf-${CT_AUTOCONF_VERSION}"

     CT_Patch "autoconf" "${CT_AUTOCONF_VERSION}"

 }

 do_companion_tools_autoconf_build() {

     CT_DoStep EXTRA "Installing autoconf"

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

     CT_Pushd "${CT_BUILD_DIR}/build-autoconf"

     # Ensure configure gets run using the CONFIG_SHELL as configure seems to

     # have trouble when CONFIG_SHELL is set and /bin/sh isn't bash

     # For reference see:

     # http://www.gnu.org/software/autoconf/manual/autoconf.html#CONFIG_005fSHELL

     CT_DoExecLog CFG ${CONFIG_SHELL} \

     "${CT_SRC_DIR}/autoconf-${CT_AUTOCONF_VERSION}/configure" \

         --prefix="${CT_BUILDTOOLS_PREFIX_DIR}"

     CT_DoExecLog ALL make

     CT_DoExecLog ALL make install

     CT_Popd

     CT_EndStep

 }