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>

# MIPS specific options for gcc

config CC_GCC_HAS_ARCH_OPTIONS

    default y

config CC_GCC_mips_llsc

    tristate

    prompt "Use llsc"

    default m

    help

      This configures how gcc will emit load-link, store-conditional and

      sync opcodes. Normally, you'd set this to 'M', and configure will do

      the correct thing (ie. enable llsc for Linux-based targets, disable

      for others). If you know better, you can force either using llsc or

      not using it (resp. 'Y' or 'N').

config CC_GCC_mips_synci

    tristate

    prompt "Use synci"

    default m

    help

      This configures how gcc will emit the synci opcode. Normally, you'd

      set this to 'M', and configure will do the correct thing (ie. disable).

      If you know better, you can force using synci (say 'Y'), or not using

      it (say 'N').

config CC_GCC_mips_plt

    bool

    prompt "Use copy relocations & PLTs"

    help

      This configures gcc to use copy relocations & PLTs. These are

      extensions to the traditional SVR4-based MIPS ABIs and require

      support from GNU binutils and the runtime C library.

      Say 'N' to keep the default and not use them, say 'Y' to use them.