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>

# ARM specific configuration file

config ARCH_ARM_MODE

    string

    default "arm"   if ARCH_ARM_MODE_ARM

    default "thumb" if ARCH_ARM_MODE_THUMB

choice

    bool

    prompt "Default instruction set mode"

    default ARCH_ARM_MODE_ARM

config ARCH_ARM_MODE_ARM

    bool

    prompt "arm"

    help

      Defaults to emitting instructions in the ARM mode.

config ARCH_ARM_MODE_THUMB

    bool

    prompt "thumb (EXPERIMENTAL)"

    depends on EXPERIMENTAL

    help

      Defaults to emitting instructions in the THUMB mode.

endchoice

config ARCH_ARM_INTERWORKING

    bool

    prompt "Use Thumb-interworking (READ HELP)"

    depends on EXPERIMENTAL

    help

      Excerpt from the gcc manual:

      > Generate code which supports calling between the ARM and Thumb

      > instruction sets. Without this option the two instruction sets

      > cannot be reliably used inside one program. The default is

      > [not to use interwork], since slightly larger code is generated

      > when [interwork] is specified.

config ARCH_ARM_EABI

    bool

    prompt "Use EABI"

    default y

    help

      Set up the toolchain so that it generates EABI-compliant binaries.

config ARCH_ARM_ABI_OK

    bool

    default y

    depends on ! ARCH_ARM_EABI

    select ARCH_SUPPORTS_WITH_ABI